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Welsbach mantle Stock Photos and Images
Jungle Brook welsbach mantle Bavaria Germany naturly forest Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-jungle-brook-welsbach-mantle-bavaria-germany-naturly-forest-18836302.htmlRMB2J1W2–Jungle Brook welsbach mantle Bavaria Germany naturly forest
An advertisement for the Welsbach incandescent gas mantle. Dated 20th century Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/an-advertisement-for-the-welsbach-incandescent-gas-mantle-dated-20th-century-image235269383.htmlRMRJNCDY–An advertisement for the Welsbach incandescent gas mantle. Dated 20th century
Method of illuminating compound microscope with gas lamp. Labels: C, Balloon flask filled with ammonium sulphate of copper and G, Welsbach mantle, vin Stock Vectorhttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/method-of-illuminating-compound-microscope-with-gas-lamp-labels-c-balloon-flask-filled-with-ammonium-sulphate-of-copper-and-g-welsbach-mantle-vin-image348665605.htmlRF2B772F1–Method of illuminating compound microscope with gas lamp. Labels: C, Balloon flask filled with ammonium sulphate of copper and G, Welsbach mantle, vin
An engraving depicting the Von Welsbach Gas Mantle. Dated 19th century Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/an-engraving-depicting-the-von-welsbach-gas-mantle-dated-19th-century-image235268366.htmlRMRJNB5J–An engraving depicting the Von Welsbach Gas Mantle. Dated 19th century
CARL AUER WELSBACH Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-carl-auer-welsbach-105263489.htmlRMG374J9–CARL AUER WELSBACH
Advertisement for Welsbach burners and gas mantles. Von Welsbach's incandescent mantle was tube of cotton impregnated with cerium and thorium oxide. The resulting rigid, brittle shape provided an efficient method of burning gas to produce a good light. Dated 20th century Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/advertisement-for-welsbach-burners-and-gas-mantles-von-welsbachs-incandescent-mantle-was-tube-of-cotton-impregnated-with-cerium-and-thorium-oxide-the-resulting-rigid-brittle-shape-provided-an-efficient-method-of-burning-gas-to-produce-a-good-light-dated-20th-century-image186400501.htmlRMMR77MN–Advertisement for Welsbach burners and gas mantles. Von Welsbach's incandescent mantle was tube of cotton impregnated with cerium and thorium oxide. The resulting rigid, brittle shape provided an efficient method of burning gas to produce a good light. Dated 20th century
Pictorial billheads for gas mantles 1913/14 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/pictorial-billheads-for-gas-mantles-191314-image8997701.htmlRMAPC9T6–Pictorial billheads for gas mantles 1913/14
Auer von Welsbach, Carl, 1.9.1858 - 4.8.1929, Austrian chemist and businessman, half length, 1913, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-auer-von-welsbach-carl-191858-481929-austrian-chemist-and-businessman-58428116.htmlRMDB1HJC–Auer von Welsbach, Carl, 1.9.1858 - 4.8.1929, Austrian chemist and businessman, half length, 1913,
An engraving depicting a gas lamp fitted with a Von Welsbach Gas Mantle. Dated 19th century Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/an-engraving-depicting-a-gas-lamp-fitted-with-a-von-welsbach-gas-mantle-dated-19th-century-image235268367.htmlRMRJNB5K–An engraving depicting a gas lamp fitted with a Von Welsbach Gas Mantle. Dated 19th century
Auer von Welsbach, Carl, 1.9.1858 - 4.8.1929, Austrian chemist and businessman, portrait, wood engraving, late 19th century, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-auer-von-welsbach-carl-191858-481929-austrian-chemist-and-businessman-106908975.htmlRMG5X3DK–Auer von Welsbach, Carl, 1.9.1858 - 4.8.1929, Austrian chemist and businessman, portrait, wood engraving, late 19th century,
Carl Auer Freiherr von Welsbach (1858-1929) was an Austrian scientist and inventor who had a talent for discovering advances and turning them into commercially successful products. He is well known for his work on rare earth elements, which led to the dev Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-carl-auer-freiherr-von-welsbach-1858-1929-was-an-austrian-scientist-104001481.htmlRMG15JXH–Carl Auer Freiherr von Welsbach (1858-1929) was an Austrian scientist and inventor who had a talent for discovering advances and turning them into commercially successful products. He is well known for his work on rare earth elements, which led to the dev
![. Catalog of portables and shades : year of 1910.. WELSBACH MANTLE-CHIMNEYS No. 93 Welsbach Junior Mantle-Chimney Tor Center-Pilot Junior Burner Only !inSle v ve 2%-in. mantle. First l,ity ] ir-hole chimney. Fi I with sle< e in se for C ,te pileJunior burner. Mu not be used on Side pilot Juni burners. * Tri in Stock Photo](https://c8.alamy.com/comp/2AFJ72B/catalog-of-portables-and-shades-year-of-1910-welsbach-mantle-chimneys-no-93-welsbach-junior-mantle-chimney-tor-center-pilot-junior-burner-only-!insle-v-ve-2-in-mantle-first-lity-ir-hole-chimney-fi-i-with-slelt-e-in-se-for-c-te-pilejunior-burner-mu-not-be-used-on-side-pilot-juni-burners-tri-in-2AFJ72B.jpg ". Catalog of portables and shades : year of 1910.. WELSBACH MANTLE-CHIMNEYS No. 93 Welsbach Junior Mantle-Chimney Tor Center-Pilot Junior Burner Only !inSle v ve 2%-in. mantle. First l,ity ] ir-hole chimney. Fi I with sle< e in se for C ,te pileJunior burner. Mu not be used on Side pilot Juni burners. * Tri in Stock Photo")
. Catalog of portables and shades : year of 1910.. WELSBACH MANTLE-CHIMNEYS No. 93 Welsbach Junior Mantle-Chimney Tor Center-Pilot Junior Burner Only !inSle v ve 2%-in. mantle. First l,ity ] ir-hole chimney. Fi I with sle< e in se for C ,te pileJunior burner. Mu not be used on Side pilot Juni burners. * Tri in Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/catalog-of-portables-and-shades-year-of-1910-welsbach-mantle-chimneys-no-93-welsbach-junior-mantle-chimney-tor-center-pilot-junior-burner-only-!insle-v-ve-2-in-mantle-first-lity-ir-hole-chimney-fi-i-with-slelt-e-in-se-for-c-te-pilejunior-burner-mu-not-be-used-on-side-pilot-juni-burners-tri-in-image336617523.htmlRM2AFJ72B–. Catalog of portables and shades : year of 1910.. WELSBACH MANTLE-CHIMNEYS No. 93 Welsbach Junior Mantle-Chimney Tor Center-Pilot Junior Burner Only !inSle v ve 2%-in. mantle. First l,ity ] ir-hole chimney. Fi I with sle< e in se for C ,te pileJunior burner. Mu not be used on Side pilot Juni burners. * Tri in
Incandescenza company, 1895. Artist: Mataloni, Giovanni (1869-1944) Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/incandescenza-company-1895-artist-mataloni-giovanni-1869-1944-image66590764.htmlRMDT9D5G–Incandescenza company, 1895. Artist: Mataloni, Giovanni (1869-1944)
Incandescenza company. Museum: PRIVATE COLLECTION. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/incandescenza-company-museum-private-collection-image212326882.htmlRMP9C92X–Incandescenza company. Museum: PRIVATE COLLECTION.
Chemical element of the periodic table - Thorium Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/chemical-element-of-the-periodic-table-thorium-image381574506.htmlRF2D4P64X–Chemical element of the periodic table - Thorium
How the Welsbach Mantle Is Made. AUTOMATIC ORE UNLOADER. The Sunflower. AND BUCKET., scientific american, 1901-03-09 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/how-the-welsbach-mantle-is-made-automatic-ore-unloader-the-sunflower-and-bucket-scientific-american-1901-03-09-image334345031.htmlRM2ABXMDY–How the Welsbach Mantle Is Made. AUTOMATIC ORE UNLOADER. The Sunflower. AND BUCKET., scientific american, 1901-03-09
Symbol for the chemical element thorium Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-symbol-for-the-chemical-element-thorium-59918450.htmlRFDDDEGJ–Symbol for the chemical element thorium
Carl Auer Freiherr von Welsbach, 1858 - 1929, an Austrian scientist and inventor, Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/carl-auer-freiherr-von-welsbach-1858-1929-an-austrian-scientist-and-image67075530.htmlRMDW3FEJ–Carl Auer Freiherr von Welsbach, 1858 - 1929, an Austrian scientist and inventor,
Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Tree trunk Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-historical-four-burner-gas-lantern-in-berlin-zehlendorf-the-photograph-136232261.htmlRFHWHWHW–Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Tree trunk
Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 i86 MISCELLANEOUS EXPERIMENTS This experiment was thrice repeated, with results the same in kind as those above. Experiment 66 Object: To ascertain the effect of the rays from a Welsbach gas mantle buried in the soil on the germination and growth of timothy grass seeds planted in the same soil. In a flower pot of earth was buried vertically the Welsbach mantle, style ' Yusia,' No. 189, purchased in the market, and on the surface of the soil were sown seeds of timothy grass. Control cul- FiG Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-effects-of-the-rays-of-radium-on-plants-effectsofraysofr1908gage-year-1908-i86-miscellaneous-experiments-this-experiment-was-thrice-repeated-with-results-the-same-in-kind-as-those-above-experiment-66-object-to-ascertain-the-effect-of-the-rays-from-a-welsbach-gas-mantle-buried-in-the-soil-on-the-germination-and-growth-of-timothy-grass-seeds-planted-in-the-same-soil-in-a-flower-pot-of-earth-was-buried-vertically-the-welsbach-mantle-style-yusia-no-189-purchased-in-the-market-and-on-the-surface-of-the-soil-were-sown-seeds-of-timothy-grass-control-cul-fig-image240876905.htmlRMRYTTXH–Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 i86 MISCELLANEOUS EXPERIMENTS This experiment was thrice repeated, with results the same in kind as those above. Experiment 66 Object: To ascertain the effect of the rays from a Welsbach gas mantle buried in the soil on the germination and growth of timothy grass seeds planted in the same soil. In a flower pot of earth was buried vertically the Welsbach mantle, style ' Yusia,' No. 189, purchased in the market, and on the surface of the soil were sown seeds of timothy grass. Control cul- FiG
. Effects of the rays of radium on plants . Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated about the same amount as those of the control, except directly under the mantle, where there is only a very slight germination. June 14, 10 A. M. The seedlings in both cultures have grown since yesterday, but the relative conditions remain as then. Both cultures were placed in the light and illuminated only from above. June 16, 10 A. M. Retardation Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-radium-on-plants-fig-46-experiment-65-method-of-exposing-germinating-seeds-to-the-rays-of-thorium-from-a-welsbach-gas-mantle-june-13-10-a-m-the-control-seeds-are-evenly-germinated-the-exposed-seeds-have-germinated-about-the-same-amount-as-those-of-the-control-except-directly-under-the-mantle-where-there-is-only-a-very-slight-germination-june-14-10-a-m-the-seedlings-in-both-cultures-have-grown-since-yesterday-but-the-relative-conditions-remain-as-then-both-cultures-were-placed-in-the-light-and-illuminated-only-from-above-june-16-10-a-m-retardation-image178405313.htmlRMMA71P9–. Effects of the rays of radium on plants . Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated about the same amount as those of the control, except directly under the mantle, where there is only a very slight germination. June 14, 10 A. M. The seedlings in both cultures have grown since yesterday, but the relative conditions remain as then. Both cultures were placed in the light and illuminated only from above. June 16, 10 A. M. Retardation
Carl Auer Freiherr von Welsbach (1858-1929) was an Austrian scientist and inventor who had a talent for not only discovering advances, but turning them into commercially successful products. He is particularly well known for his work on rare earth element Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-carl-auer-freiherr-von-welsbach-1858-1929-was-an-austrian-scientist-104001482.htmlRMG15JXJ–Carl Auer Freiherr von Welsbach (1858-1929) was an Austrian scientist and inventor who had a talent for not only discovering advances, but turning them into commercially successful products. He is particularly well known for his work on rare earth element
Science for beginners . he open flame jet, or fish tail burner,usually burns about 5 cu. ft. of gas per hour. If gas costs$1.00 per 1000 cu. ft. the cost per hour for gas is about 5mills for an open flame jet. When gas is burned in a Welsbach mantle it is generallyconsumed at the rate of from 3% to 5 cu. ft. per hour. Thecost for gas, is, therefore, from 3% to 5 mills per hour. Electricity is sold by the watt-hour or kilowatt-hour.The kilowatt-hour is equal to 1000 watt-hours. The ordinary NATURAL AND ARTIFICIAL LIGHTING 63 house meter reads off directly the number of kilowatt-hours ofcurrent Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/science-for-beginners-he-open-flame-jet-or-fish-tail-burnerusually-burns-about-5-cu-ft-of-gas-per-hour-if-gas-costs100-per-1000-cu-ft-the-cost-per-hour-for-gas-is-about-5mills-for-an-open-flame-jet-when-gas-is-burned-in-a-welsbach-mantle-it-is-generallyconsumed-at-the-rate-of-from-3-to-5-cu-ft-per-hour-thecost-for-gas-is-therefore-from-3-to-5-mills-per-hour-electricity-is-sold-by-the-watt-hour-or-kilowatt-hourthe-kilowatt-hour-is-equal-to-1000-watt-hours-the-ordinary-natural-and-artificial-lighting-63-house-meter-reads-off-directly-the-number-of-kilowatt-hours-ofcurrent-image340308463.htmlRM2ANJAWK–Science for beginners . he open flame jet, or fish tail burner,usually burns about 5 cu. ft. of gas per hour. If gas costs$1.00 per 1000 cu. ft. the cost per hour for gas is about 5mills for an open flame jet. When gas is burned in a Welsbach mantle it is generallyconsumed at the rate of from 3% to 5 cu. ft. per hour. Thecost for gas, is, therefore, from 3% to 5 mills per hour. Electricity is sold by the watt-hour or kilowatt-hour.The kilowatt-hour is equal to 1000 watt-hours. The ordinary NATURAL AND ARTIFICIAL LIGHTING 63 house meter reads off directly the number of kilowatt-hours ofcurrent
Bec Auer, 1896. Artist: Privat-Livemont, Henri (1861–1936) Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bec-auer-1896-artist-privat-livemont-henri-18611936-image66589266.htmlRMDT9B82–Bec Auer, 1896. Artist: Privat-Livemont, Henri (1861–1936)
Bec Auer. Museum: PRIVATE COLLECTION. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/bec-auer-museum-private-collection-image212326540.htmlRMP9C8JM–Bec Auer. Museum: PRIVATE COLLECTION.
SIMPLE MEANS OF COOLING DRINKING WATER. SIMPLE MEANS OF COOLING DRINKING WATER. 4 4 THE ACCURATE WEIGHING OF LOCOMOTIVES. The Origin of the Consul. The Value of Meat Extracts. Theory of Welsbach Incandescent Mantle. A SIMPLE CHIMNEY TOP AND COWL. SCHMALL'S CHIMNEY TOP AND COWL. The Temperature of the Aged. i, scientific american, 99-09-09 Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/simple-means-of-cooling-drinking-water-simple-means-of-cooling-drinking-water-4-4-the-accurate-weighing-of-locomotives-the-origin-of-the-consul-the-value-of-meat-extracts-theory-of-welsbach-incandescent-mantle-a-simple-chimney-top-and-cowl-schmalls-chimney-top-and-cowl-the-temperature-of-the-aged-i-scientific-american-99-09-09-image334343325.htmlRM2ABXJ91–SIMPLE MEANS OF COOLING DRINKING WATER. SIMPLE MEANS OF COOLING DRINKING WATER. 4 4 THE ACCURATE WEIGHING OF LOCOMOTIVES. The Origin of the Consul. The Value of Meat Extracts. Theory of Welsbach Incandescent Mantle. A SIMPLE CHIMNEY TOP AND COWL. SCHMALL'S CHIMNEY TOP AND COWL. The Temperature of the Aged. i, scientific american, 99-09-09
Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-historical-four-burner-gas-lantern-in-berlin-zehlendorf-the-photograph-136232273.htmlRFHWHWJ9–Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day.
Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 MISCELLANEOUS EXPERIMENTS 185 zontally over the seeds at right angles to the row, and about 3 or 4 mm. above them, was the Welsbach mantle, style 'Yusia,' No. 189, purchased in the market (Figure 46). Control, with no mantle, and both cultures placed in the dark room, in a moist chamber. Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated a Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-effects-of-the-rays-of-radium-on-plants-effectsofraysofr1908gage-year-1908-miscellaneous-experiments-185-zontally-over-the-seeds-at-right-angles-to-the-row-and-about-3-or-4-mm-above-them-was-the-welsbach-mantle-style-yusia-no-189-purchased-in-the-market-figure-46-control-with-no-mantle-and-both-cultures-placed-in-the-dark-room-in-a-moist-chamber-fig-46-experiment-65-method-of-exposing-germinating-seeds-to-the-rays-of-thorium-from-a-welsbach-gas-mantle-june-13-10-a-m-the-control-seeds-are-evenly-germinated-the-exposed-seeds-have-germinated-a-image240874582.htmlRMRYTNYJ–Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 MISCELLANEOUS EXPERIMENTS 185 zontally over the seeds at right angles to the row, and about 3 or 4 mm. above them, was the Welsbach mantle, style 'Yusia,' No. 189, purchased in the market (Figure 46). Control, with no mantle, and both cultures placed in the dark room, in a moist chamber. Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated a
. Effects of the rays of radium on plants . FiG. 47. Experiment 65. Effect of Thorium Rajs from a Welsbach Gas Mantle on the growth of Timothy Grass. Cf. Fig. 46. ture with no mantle, and both cultures placed in the dark room, and watered from below until the water had soaked up to the surface of the soil. The seeds germinated in both cultures and produced good healthy plants, but throughout the duration of the experiment no difference could be detected in the height or other characters of the plants in the two pots. The experiment was repeated, but with similar, /. e., negative, results. Summ Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-radium-on-plants-fig-47-experiment-65-effect-of-thorium-rajs-from-a-welsbach-gas-mantle-on-the-growth-of-timothy-grass-cf-fig-46-ture-with-no-mantle-and-both-cultures-placed-in-the-dark-room-and-watered-from-below-until-the-water-had-soaked-up-to-the-surface-of-the-soil-the-seeds-germinated-in-both-cultures-and-produced-good-healthy-plants-but-throughout-the-duration-of-the-experiment-no-difference-could-be-detected-in-the-height-or-other-characters-of-the-plants-in-the-two-pots-the-experiment-was-repeated-but-with-similar-e-negative-results-summ-image178405306.htmlRMMA71P2–. Effects of the rays of radium on plants . FiG. 47. Experiment 65. Effect of Thorium Rajs from a Welsbach Gas Mantle on the growth of Timothy Grass. Cf. Fig. 46. ture with no mantle, and both cultures placed in the dark room, and watered from below until the water had soaked up to the surface of the soil. The seeds germinated in both cultures and produced good healthy plants, but throughout the duration of the experiment no difference could be detected in the height or other characters of the plants in the two pots. The experiment was repeated, but with similar, /. e., negative, results. Summ
. The interpretation of radium and the structure of the atom . Fig. I.—Becquerels Uranium Picture.. Fig. 2.—Welsbach Mantle imprinted by its Own Rays. To face p. 7 URANIUM RADIATION 7 phosphorescent substance which was then exposedto sunhght. By great good fortune M. Becquerelchose as the particular phosphorescent body a prep-aration of uranium, and found as the result of theexperiment that the photographic plate beneath thepreparation was darkened. The preparation had givenout rays which, unlike sunlight, were capable of pene-trating the black paper. It was soon found that theserays, like the Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-interpretation-of-radium-and-the-structure-of-the-atom-fig-ibecquerels-uranium-picture-fig-2welsbach-mantle-imprinted-by-its-own-rays-to-face-p-7-uranium-radiation-7-phosphorescent-substance-which-was-then-exposedto-sunhght-by-great-good-fortune-m-becquerelchose-as-the-particular-phosphorescent-body-a-prep-aration-of-uranium-and-found-as-the-result-of-theexperiment-that-the-photographic-plate-beneath-thepreparation-was-darkened-the-preparation-had-givenout-rays-which-unlike-sunlight-were-capable-of-pene-trating-the-black-paper-it-was-soon-found-that-theserays-like-the-image376072554.htmlRM2CRRGAJ–. The interpretation of radium and the structure of the atom . Fig. I.—Becquerels Uranium Picture.. Fig. 2.—Welsbach Mantle imprinted by its Own Rays. To face p. 7 URANIUM RADIATION 7 phosphorescent substance which was then exposedto sunhght. By great good fortune M. Becquerelchose as the particular phosphorescent body a prep-aration of uranium, and found as the result of theexperiment that the photographic plate beneath thepreparation was darkened. The preparation had givenout rays which, unlike sunlight, were capable of pene-trating the black paper. It was soon found that theserays, like the
Rayon d'or - Dernier mot de l'Eclairage, 1895. Artist: Paléologue (Paleologu), Jean de (1855-1942) Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/rayon-dor-dernier-mot-de-leclairage-1895-artist-palologue-paleologu-image66591291.htmlRMDT9DTB–Rayon d'or - Dernier mot de l'Eclairage, 1895. Artist: Paléologue (Paleologu), Jean de (1855-1942)
Rayon d'or - Dernier mot de l'Eclairage. Museum: PRIVATE COLLECTION. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/rayon-dor-dernier-mot-de-leclairage-museum-private-collection-image212327047.htmlRMP9C98R–Rayon d'or - Dernier mot de l'Eclairage. Museum: PRIVATE COLLECTION.
Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Tree trunk Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-historical-four-burner-gas-lantern-in-berlin-zehlendorf-the-photograph-136232247.htmlRFHWHWHB–Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Tree trunk
Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 120 ELEMENTARY CHEMICAL MICROSCOPY In the absence of an arc lamp use a 400-watt Mazda lamp with concentrated filament. Or if gas alone is available, employ an inverted Welsbach incandescent mantle or even better an acetylene light. Be sure that the reflecting condenser is high enough in its mounting to just touch the object cell upon the stage. Substage ultracondensers are usually screwed into their tubular mountings and are easily turned up or down to permit of their accurate adjustment. T Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/elementary-chemical-microscopy-1921-elementary-chemical-microscopy-elementarychemi00cham-year-1921-120-elementary-chemical-microscopy-in-the-absence-of-an-arc-lamp-use-a-400-watt-mazda-lamp-with-concentrated-filament-or-if-gas-alone-is-available-employ-an-inverted-welsbach-incandescent-mantle-or-even-better-an-acetylene-light-be-sure-that-the-reflecting-condenser-is-high-enough-in-its-mounting-to-just-touch-the-object-cell-upon-the-stage-substage-ultracondensers-are-usually-screwed-into-their-tubular-mountings-and-are-easily-turned-up-or-down-to-permit-of-their-accurate-adjustment-t-image240837953.htmlRMRYR37D–Elementary chemical microscopy (1921) Elementary chemical microscopy . elementarychemi00cham Year: 1921 120 ELEMENTARY CHEMICAL MICROSCOPY In the absence of an arc lamp use a 400-watt Mazda lamp with concentrated filament. Or if gas alone is available, employ an inverted Welsbach incandescent mantle or even better an acetylene light. Be sure that the reflecting condenser is high enough in its mounting to just touch the object cell upon the stage. Substage ultracondensers are usually screwed into their tubular mountings and are easily turned up or down to permit of their accurate adjustment. T
![. Effects of the rays of radium on plants . Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and growth Stock Photo](https://c8.alamy.com/comp/MA71P7/effects-of-the-rays-of-radium-on-plants-fig-47a-experiment-60-response-of-chloroplasts-to-radium-rajs-the-sprouting-of-a-potato-was-evidently-not-affected-by-having-the-radium-tube-1500000-x-inserted-into-the-tissue-of-the-tuber-about-10-mm-from-the-quot-eyequot-no-effect-on-germination-followed-an-exposure-of-dry-timothy-grass-seed-for-161-hours-to-the-a-rays-from-a-rod-coated-with-polonium-the-thorium-rays-from-a-welsbach-gas-mantle-retarded-the-growth-of-timothy-grass-when-the-mantle-was-placed-over-the-seeds-germinating-on-the-surface-of-soil-but-germination-and-growth-MA71P7.jpg ". Effects of the rays of radium on plants . Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and growth Stock Photo")
. Effects of the rays of radium on plants . Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and growth Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-radium-on-plants-fig-47a-experiment-60-response-of-chloroplasts-to-radium-rajs-the-sprouting-of-a-potato-was-evidently-not-affected-by-having-the-radium-tube-1500000-x-inserted-into-the-tissue-of-the-tuber-about-10-mm-from-the-quot-eyequot-no-effect-on-germination-followed-an-exposure-of-dry-timothy-grass-seed-for-161-hours-to-the-a-rays-from-a-rod-coated-with-polonium-the-thorium-rays-from-a-welsbach-gas-mantle-retarded-the-growth-of-timothy-grass-when-the-mantle-was-placed-over-the-seeds-germinating-on-the-surface-of-soil-but-germination-and-growth-image178405311.htmlRMMA71P7–. Effects of the rays of radium on plants . Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and growth
. The London, Edinburgh and Dublin philosophical magazine and journal of science. ilter—showedvery irregular character. Nevertheless, it was evident thatthe main element of the investigated radiation was suppliedby a radiation of about the same mean wave-length as thatresulting from the Welsbach mantle with this arrangement.But as soon as a 15 mm. thick layer of quartz was inserted,the aspect was changed. The first minimum, which hadbeen observed for unfiltered radiation at a thickness of theair-film of about 5 divisions of the drum* (26 //,), now didnot appear before a thickness of the layer Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-london-edinburgh-and-dublin-philosophical-magazine-and-journal-of-science-iltershowedvery-irregular-character-nevertheless-it-was-evident-thatthe-main-element-of-the-investigated-radiation-was-suppliedby-a-radiation-of-about-the-same-mean-wave-length-as-thatresulting-from-the-welsbach-mantle-with-this-arrangementbut-as-soon-as-a-15-mm-thick-layer-of-quartz-was-insertedthe-aspect-was-changed-the-first-minimum-which-hadbeen-observed-for-unfiltered-radiation-at-a-thickness-of-theair-film-of-about-5-divisions-of-the-drum-26-now-didnot-appear-before-a-thickness-of-the-layer-image370501384.htmlRM2CENP88–. The London, Edinburgh and Dublin philosophical magazine and journal of science. ilter—showedvery irregular character. Nevertheless, it was evident thatthe main element of the investigated radiation was suppliedby a radiation of about the same mean wave-length as thatresulting from the Welsbach mantle with this arrangement.But as soon as a 15 mm. thick layer of quartz was inserted,the aspect was changed. The first minimum, which hadbeen observed for unfiltered radiation at a thickness of theair-film of about 5 divisions of the drum* (26 //,), now didnot appear before a thickness of the layer
Incandescent a gas. Brevetto Auer, 1895. Private Collection Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/incandescent-a-gas-brevetto-auer-1895-private-collection-image599663894.htmlRM2WRH1BJ–Incandescent a gas. Brevetto Auer, 1895. Private Collection
Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Tree trunk Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/stock-photo-historical-four-burner-gas-lantern-in-berlin-zehlendorf-the-photograph-136232436.htmlRFHWHWT4–Historical four-burner gas lantern in Berlin Zehlendorf. The Photograph was captured shortly before the evening dusk, on the a cloudy day. Tree trunk
Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the ' eye.' No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-effects-of-the-rays-of-radium-on-plants-effectsofraysofr1908gage-year-1908-fig-47a-experiment-60-response-of-chloroplasts-to-radium-rajs-the-sprouting-of-a-potato-was-evidently-not-affected-by-having-the-radium-tube-1500000-x-inserted-into-the-tissue-of-the-tuber-about-10-mm-from-the-eye-no-effect-on-germination-followed-an-exposure-of-dry-timothy-grass-seed-for-161-hours-to-the-a-rays-from-a-rod-coated-with-polonium-the-thorium-rays-from-a-welsbach-gas-mantle-retarded-the-growth-of-timothy-grass-when-the-mantle-was-placed-over-the-seeds-germinating-on-image240874879.htmlRMRYTPA7–Effects of the rays of Effects of the rays of radium on plants . effectsofraysofr1908gage Year: 1908 Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the ' eye.' No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on
. Carnegie Institution of Washington publication. VAPOR NUCLEI AND IONS. (Welsbach mantle) was 250 cm. beyond the fog chamber. Usually the angular diameter of the coronas is about 5/30. In table i, 5t refers to the goniometer nearer the radium, s2 to the other, and Nt and N2 are the corresponding nucleations, when D is the distance of the radium tube from the end of the cylinder. After the influx of filtered air, time was always allowed for the dissi- pation of convection currents. There was some difficulty in reading both goniometers consecutively without loss of time, as the small coronas so Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/carnegie-institution-of-washington-publication-vapor-nuclei-and-ions-welsbach-mantle-was-250-cm-beyond-the-fog-chamber-usually-the-angular-diameter-of-the-coronas-is-about-530-in-table-i-5t-refers-to-the-goniometer-nearer-the-radium-s2-to-the-other-and-nt-and-n2-are-the-corresponding-nucleations-when-d-is-the-distance-of-the-radium-tube-from-the-end-of-the-cylinder-after-the-influx-of-filtered-air-time-was-always-allowed-for-the-dissi-pation-of-convection-currents-there-was-some-difficulty-in-reading-both-goniometers-consecutively-without-loss-of-time-as-the-small-coronas-so-image233512192.htmlRMRFWB54–. Carnegie Institution of Washington publication. VAPOR NUCLEI AND IONS. (Welsbach mantle) was 250 cm. beyond the fog chamber. Usually the angular diameter of the coronas is about 5/30. In table i, 5t refers to the goniometer nearer the radium, s2 to the other, and Nt and N2 are the corresponding nucleations, when D is the distance of the radium tube from the end of the cylinder. After the influx of filtered air, time was always allowed for the dissi- pation of convection currents. There was some difficulty in reading both goniometers consecutively without loss of time, as the small coronas so
. Carnegie Institution of Washington publication. STANDARDIZATION AND EFFICIENCY OF THE FOG CHAMBER. 23 To facilitate comparison with the later work, where mercury light is used, a series of coronas in geometric sequence is given in table 9, in which the Welsbach mantle still furnishes the light. Here 5 denotes the chord of the angular diameter of the coronal disk on a radius of R = 30 cm., when. ?0 18 16 FIG. 3.—Charts for white light (Welsbach burner), -?/3°> °f the reddish edge of the disk of coronas, in terms of a number, z, of the successive identical partial exhaustions in the series. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/carnegie-institution-of-washington-publication-standardization-and-efficiency-of-the-fog-chamber-23-to-facilitate-comparison-with-the-later-work-where-mercury-light-is-used-a-series-of-coronas-in-geometric-sequence-is-given-in-table-9-in-which-the-welsbach-mantle-still-furnishes-the-light-here-5-denotes-the-chord-of-the-angular-diameter-of-the-coronal-disk-on-a-radius-of-r-=-30-cm-when-0-18-16-fig-3charts-for-white-light-welsbach-burner-3gt-f-the-reddish-edge-of-the-disk-of-coronas-in-terms-of-a-number-z-of-the-successive-identical-partial-exhaustions-in-the-series-image233472783.htmlRMRFRGWK–. Carnegie Institution of Washington publication. STANDARDIZATION AND EFFICIENCY OF THE FOG CHAMBER. 23 To facilitate comparison with the later work, where mercury light is used, a series of coronas in geometric sequence is given in table 9, in which the Welsbach mantle still furnishes the light. Here 5 denotes the chord of the angular diameter of the coronal disk on a radius of R = 30 cm., when. ?0 18 16 FIG. 3.—Charts for white light (Welsbach burner), -?/3°> °f the reddish edge of the disk of coronas, in terms of a number, z, of the successive identical partial exhaustions in the series.
![. Effects of the rays of radium on plants. Plants. MISCELLANEOUS EXPERIMENTS 185 zontally over the seeds at right angles to the row, and about 3 or 4 mm. above them, was the Welsbach mantle, style "Yusia," No. 189, purchased in the market (Figure 46). Control, with no mantle, and both cultures placed in the dark room, in a moist chamber.. Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated about the same amount as those of the contro Stock Photo](https://c8.alamy.com/comp/RDD73F/effects-of-the-rays-of-radium-on-plants-plants-miscellaneous-experiments-185-zontally-over-the-seeds-at-right-angles-to-the-row-and-about-3-or-4-mm-above-them-was-the-welsbach-mantle-style-quotyusiaquot-no-189-purchased-in-the-market-figure-46-control-with-no-mantle-and-both-cultures-placed-in-the-dark-room-in-a-moist-chamber-fig-46-experiment-65-method-of-exposing-germinating-seeds-to-the-rays-of-thorium-from-a-welsbach-gas-mantle-june-13-10-a-m-the-control-seeds-are-evenly-germinated-the-exposed-seeds-have-germinated-about-the-same-amount-as-those-of-the-contro-RDD73F.jpg ". Effects of the rays of radium on plants. Plants. MISCELLANEOUS EXPERIMENTS 185 zontally over the seeds at right angles to the row, and about 3 or 4 mm. above them, was the Welsbach mantle, style "Yusia," No. 189, purchased in the market (Figure 46). Control, with no mantle, and both cultures placed in the dark room, in a moist chamber.. Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated about the same amount as those of the contro Stock Photo")
. Effects of the rays of radium on plants. Plants. MISCELLANEOUS EXPERIMENTS 185 zontally over the seeds at right angles to the row, and about 3 or 4 mm. above them, was the Welsbach mantle, style "Yusia," No. 189, purchased in the market (Figure 46). Control, with no mantle, and both cultures placed in the dark room, in a moist chamber.. Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated about the same amount as those of the contro Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-radium-on-plants-plants-miscellaneous-experiments-185-zontally-over-the-seeds-at-right-angles-to-the-row-and-about-3-or-4-mm-above-them-was-the-welsbach-mantle-style-quotyusiaquot-no-189-purchased-in-the-market-figure-46-control-with-no-mantle-and-both-cultures-placed-in-the-dark-room-in-a-moist-chamber-fig-46-experiment-65-method-of-exposing-germinating-seeds-to-the-rays-of-thorium-from-a-welsbach-gas-mantle-june-13-10-a-m-the-control-seeds-are-evenly-germinated-the-exposed-seeds-have-germinated-about-the-same-amount-as-those-of-the-contro-image232016275.htmlRMRDD73F–. Effects of the rays of radium on plants. Plants. MISCELLANEOUS EXPERIMENTS 185 zontally over the seeds at right angles to the row, and about 3 or 4 mm. above them, was the Welsbach mantle, style "Yusia," No. 189, purchased in the market (Figure 46). Control, with no mantle, and both cultures placed in the dark room, in a moist chamber.. Fig. 46. Experiment 65. Method of exposing germinating Seeds to the Rays of Thorium from a Welsbach Gas Mantle. June 13, 10 A, M. The control seeds are evenly germinated. The exposed seeds have germinated about the same amount as those of the contro
![. Effects of the rays of radium on plants. Plants. i86 MISCELLANEOUS EXPERIMENTS This experiment was thrice repeated, with results the same in kind as those above. Experiment 66 Object: To ascertain the effect of the rays from a Welsbach gas mantle buried in the soil on the germination and growth of timothy grass seeds planted in the same soil. In a flower pot of earth was buried vertically the Welsbach mantle, style " Yusia," No. 189, purchased in the market, and on the surface of the soil were sown seeds of timothy grass. Control cul-. FiG. 47. Experiment 65. Effect of Thorium Rajs Stock Photo](https://c8.alamy.com/comp/RDC1A3/effects-of-the-rays-of-radium-on-plants-plants-i86-miscellaneous-experiments-this-experiment-was-thrice-repeated-with-results-the-same-in-kind-as-those-above-experiment-66-object-to-ascertain-the-effect-of-the-rays-from-a-welsbach-gas-mantle-buried-in-the-soil-on-the-germination-and-growth-of-timothy-grass-seeds-planted-in-the-same-soil-in-a-flower-pot-of-earth-was-buried-vertically-the-welsbach-mantle-style-quot-yusiaquot-no-189-purchased-in-the-market-and-on-the-surface-of-the-soil-were-sown-seeds-of-timothy-grass-control-cul-fig-47-experiment-65-effect-of-thorium-rajs-RDC1A3.jpg ". Effects of the rays of radium on plants. Plants. i86 MISCELLANEOUS EXPERIMENTS This experiment was thrice repeated, with results the same in kind as those above. Experiment 66 Object: To ascertain the effect of the rays from a Welsbach gas mantle buried in the soil on the germination and growth of timothy grass seeds planted in the same soil. In a flower pot of earth was buried vertically the Welsbach mantle, style " Yusia," No. 189, purchased in the market, and on the surface of the soil were sown seeds of timothy grass. Control cul-. FiG. 47. Experiment 65. Effect of Thorium Rajs Stock Photo")
. Effects of the rays of radium on plants. Plants. i86 MISCELLANEOUS EXPERIMENTS This experiment was thrice repeated, with results the same in kind as those above. Experiment 66 Object: To ascertain the effect of the rays from a Welsbach gas mantle buried in the soil on the germination and growth of timothy grass seeds planted in the same soil. In a flower pot of earth was buried vertically the Welsbach mantle, style " Yusia," No. 189, purchased in the market, and on the surface of the soil were sown seeds of timothy grass. Control cul-. FiG. 47. Experiment 65. Effect of Thorium Rajs Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-radium-on-plants-plants-i86-miscellaneous-experiments-this-experiment-was-thrice-repeated-with-results-the-same-in-kind-as-those-above-experiment-66-object-to-ascertain-the-effect-of-the-rays-from-a-welsbach-gas-mantle-buried-in-the-soil-on-the-germination-and-growth-of-timothy-grass-seeds-planted-in-the-same-soil-in-a-flower-pot-of-earth-was-buried-vertically-the-welsbach-mantle-style-quot-yusiaquot-no-189-purchased-in-the-market-and-on-the-surface-of-the-soil-were-sown-seeds-of-timothy-grass-control-cul-fig-47-experiment-65-effect-of-thorium-rajs-image231989803.htmlRMRDC1A3–. Effects of the rays of radium on plants. Plants. i86 MISCELLANEOUS EXPERIMENTS This experiment was thrice repeated, with results the same in kind as those above. Experiment 66 Object: To ascertain the effect of the rays from a Welsbach gas mantle buried in the soil on the germination and growth of timothy grass seeds planted in the same soil. In a flower pot of earth was buried vertically the Welsbach mantle, style " Yusia," No. 189, purchased in the market, and on the surface of the soil were sown seeds of timothy grass. Control cul-. FiG. 47. Experiment 65. Effect of Thorium Rajs
. Catalog of portables and shades : year of 1910.. 1 No. 10 Light Complete with No. 10 Welsbach InvertedBurner; Welsbach Inverted Mantle; No.1702 roughed top air-hole Globe, and 4-inchGooseneck. Finish: Polished or Brushed brass.. f/0 0* J}****. (sO^Vt/f; K LL Prices: 100 lots .Less than / &0 100 lots /A?** Each Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/catalog-of-portables-and-shades-year-of-1910-1-no-10-light-complete-with-no-10-welsbach-invertedburner-welsbach-inverted-mantle-no1702-roughed-top-air-hole-globe-and-4-inchgooseneck-finish-polished-or-brushed-brass-f0-0-j-sovtf-k-ll-prices-100-lots-less-than-0-100-lots-a-each-image336604119.htmlRM2AFHHYK–. Catalog of portables and shades : year of 1910.. 1 No. 10 Light Complete with No. 10 Welsbach InvertedBurner; Welsbach Inverted Mantle; No.1702 roughed top air-hole Globe, and 4-inchGooseneck. Finish: Polished or Brushed brass.. f/0 0* J}****. (sO^Vt/f; K LL Prices: 100 lots .Less than / &0 100 lots /A?** Each
A manual of hygiene and sanitation . s of certain metalswhich have the property of becoming intensely luminouswhen sufficiently heated. It gives a white light of greatilluminating and considerable actinic power, and of prac-tically unvarying intensity. In fact, this quality ofsteadiness, in which it surpasses even the incandescentelectric light, is by no means the least of its hygienicadvantages, since such steadiness is an important factorin the conservation of the eyesight. Recently hydrocarbon (gasoline) lamps, making use ofan incandescent mantle similar to the Welsbach, havebeen placed on Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/a-manual-of-hygiene-and-sanitation-s-of-certain-metalswhich-have-the-property-of-becoming-intensely-luminouswhen-sufficiently-heated-it-gives-a-white-light-of-greatilluminating-and-considerable-actinic-power-and-of-prac-tically-unvarying-intensity-in-fact-this-quality-ofsteadiness-in-which-it-surpasses-even-the-incandescentelectric-light-is-by-no-means-the-least-of-its-hygienicadvantages-since-such-steadiness-is-an-important-factorin-the-conservation-of-the-eyesight-recently-hydrocarbon-gasoline-lamps-making-use-ofan-incandescent-mantle-similar-to-the-welsbach-havebeen-placed-on-image338378780.htmlRM2AJEDGC–A manual of hygiene and sanitation . s of certain metalswhich have the property of becoming intensely luminouswhen sufficiently heated. It gives a white light of greatilluminating and considerable actinic power, and of prac-tically unvarying intensity. In fact, this quality ofsteadiness, in which it surpasses even the incandescentelectric light, is by no means the least of its hygienicadvantages, since such steadiness is an important factorin the conservation of the eyesight. Recently hydrocarbon (gasoline) lamps, making use ofan incandescent mantle similar to the Welsbach, havebeen placed on
Pacific Gas and Electric magazine . ertise-ment of gas for illumination is light. The General Gas Light Company andthe Welsbach Company came to the frontwith an offer to furnish all the necessarylighting fixtures, glassware and mantlesfor the complete equipment of the ex-hibit and the maintenance of these lamps. When it is considered that the exhibitis lighted by 14 five-mantle arcs, (31three, four and five-mantle semi-indirectfixtures; 80 bracket lamps; 8 inside archnui)s, and 14 outdoor single mantlelamps, which does not include the lami)son display by the Lindsay, Welsbach andGeneral Gas Li Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/pacific-gas-and-electric-magazine-ertise-ment-of-gas-for-illumination-is-light-the-general-gas-light-company-andthe-welsbach-company-came-to-the-frontwith-an-offer-to-furnish-all-the-necessarylighting-fixtures-glassware-and-mantlesfor-the-complete-equipment-of-the-ex-hibit-and-the-maintenance-of-these-lamps-when-it-is-considered-that-the-exhibitis-lighted-by-14-five-mantle-arcs-31three-four-and-five-mantle-semi-indirectfixtures-80-bracket-lamps-8-inside-archnuis-and-14-outdoor-single-mantlelamps-which-does-not-include-the-lamison-display-by-the-lindsay-welsbach-andgeneral-gas-li-image339143826.htmlRM2AKN9BE–Pacific Gas and Electric magazine . ertise-ment of gas for illumination is light. The General Gas Light Company andthe Welsbach Company came to the frontwith an offer to furnish all the necessarylighting fixtures, glassware and mantlesfor the complete equipment of the ex-hibit and the maintenance of these lamps. When it is considered that the exhibitis lighted by 14 five-mantle arcs, (31three, four and five-mantle semi-indirectfixtures; 80 bracket lamps; 8 inside archnui)s, and 14 outdoor single mantlelamps, which does not include the lami)son display by the Lindsay, Welsbach andGeneral Gas Li
. Catalog of portables and shades : year of 1910.. , l/2 Inches /. For list Nos. 53 and 54 Welsbach Junior Mantle-ChimneysFor Side-Pilot Junior Burners Only No. 53 Single weave ramie, 2%-in. mantle.1; iuahty India mica air-hole chimney. r ^ ^/,7 Price, per 100. .ft O 0 O x^^-. dozen... ^.^.jT. .^ No IAmber Light Junior ame e as No. 53. Gives an am- rr£j&sr:ight^ ^rab,e Price, per 100 . / J O 0 gl^.g* dozen. .^J.JOJZ Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/catalog-of-portables-and-shades-year-of-1910-l2-inches-for-list-nos-53-and-54-welsbach-junior-mantle-chimneysfor-side-pilot-junior-burners-only-no-53-single-weave-ramie-2-in-mantle1-iuahty-india-mica-air-hole-chimney-r-7-price-per-100-ft-o-0-o-x-dozen-jt-no-iamber-light-junior-ame-e-as-no-53-gives-an-am-rrjsright-rabe-price-per-100-j-o-0-glg-dozen-jjojz-image336617389.htmlRM2AFJ6WH–. Catalog of portables and shades : year of 1910.. , l/2 Inches /. For list Nos. 53 and 54 Welsbach Junior Mantle-ChimneysFor Side-Pilot Junior Burners Only No. 53 Single weave ramie, 2%-in. mantle.1; iuahty India mica air-hole chimney. r ^ ^/,7 Price, per 100. .ft O 0 O x^^-. dozen... ^.^.jT. .^ No IAmber Light Junior ame e as No. 53. Gives an am- rr£j&sr:ight^ ^rab,e Price, per 100 . / J O 0 gl^.g* dozen. .^J.JOJZ
![. The Becquerel rays and the properties of radium. Photograph of a Welsbach Incandescent Gas Manjxe, TAKEN BY MR. RICHARD KERR. THE MANTLE WAS OPENED IJUT AND LAID FLAT ON A PLATE. IHE EXPOSURE LASTED FOR EIGHT DAYS. THE THORIUM CONTAINED IN THE JMANJ LE MAKES IT RADIO-ACI HE, AND ENABLES IT TO ACT ON THE PLATE. PLATE IT.. Photograi]! of A PIi:CE OF rFi;H-l-ACTIVE, SHOW LIGHT. SLIGHTDARKENING CAN BK SEEN oirrSIDK THE LI.MIT OF THE ITTCH-BLENI) ; PHIS IS DUETO liECQUEREL RAYS FROJI THE SIDES OK l HE SlECIMEN, WHICH FALL ON TPIEOUTLYING PAKTS OF THE PLATE. PLATE III. Stock Photo](https://c8.alamy.com/comp/2AG5RCR/the-becquerel-rays-and-the-properties-of-radium-photograph-of-a-welsbach-incandescent-gas-manjxe-taken-by-mr-richard-kerr-the-mantle-was-opened-ijut-and-laid-flat-on-a-plate-ihe-exposure-lasted-for-eight-days-the-thorium-contained-in-the-jmanj-le-makes-it-radio-aci-he-and-enables-it-to-act-on-the-plate-plate-it-photograi-!-of-a-piice-of-rfih-l-active-show-light-slightdarkening-can-bk-seen-oirrsidk-the-limit-of-the-ittch-bleni-phis-is-dueto-liecquerel-rays-froji-the-sides-ok-l-he-slecimen-which-fall-on-tpieoutlying-pakts-of-the-plate-plate-iii-2AG5RCR.jpg ". The Becquerel rays and the properties of radium. Photograph of a Welsbach Incandescent Gas Manjxe, TAKEN BY MR. RICHARD KERR. THE MANTLE WAS OPENED IJUT AND LAID FLAT ON A PLATE. IHE EXPOSURE LASTED FOR EIGHT DAYS. THE THORIUM CONTAINED IN THE JMANJ LE MAKES IT RADIO-ACI HE, AND ENABLES IT TO ACT ON THE PLATE. PLATE IT.. Photograi]! of A PIi:CE OF rFi;H-l-ACTIVE, SHOW LIGHT. SLIGHTDARKENING CAN BK SEEN oirrSIDK THE LI.MIT OF THE ITTCH-BLENI) ; PHIS IS DUETO liECQUEREL RAYS FROJI THE SIDES OK l HE SlECIMEN, WHICH FALL ON TPIEOUTLYING PAKTS OF THE PLATE. PLATE III. Stock Photo")
. The Becquerel rays and the properties of radium. Photograph of a Welsbach Incandescent Gas Manjxe, TAKEN BY MR. RICHARD KERR. THE MANTLE WAS OPENED IJUT AND LAID FLAT ON A PLATE. IHE EXPOSURE LASTED FOR EIGHT DAYS. THE THORIUM CONTAINED IN THE JMANJ LE MAKES IT RADIO-ACI HE, AND ENABLES IT TO ACT ON THE PLATE. PLATE IT.. Photograi]! of A PIi:CE OF rFi;H-l-ACTIVE, SHOW LIGHT. SLIGHTDARKENING CAN BK SEEN oirrSIDK THE LI.MIT OF THE ITTCH-BLENI) ; PHIS IS DUETO liECQUEREL RAYS FROJI THE SIDES OK l HE SlECIMEN, WHICH FALL ON TPIEOUTLYING PAKTS OF THE PLATE. PLATE III. Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/the-becquerel-rays-and-the-properties-of-radium-photograph-of-a-welsbach-incandescent-gas-manjxe-taken-by-mr-richard-kerr-the-mantle-was-opened-ijut-and-laid-flat-on-a-plate-ihe-exposure-lasted-for-eight-days-the-thorium-contained-in-the-jmanj-le-makes-it-radio-aci-he-and-enables-it-to-act-on-the-plate-plate-it-photograi-!-of-a-piice-of-rfih-l-active-show-light-slightdarkening-can-bk-seen-oirrsidk-the-limit-of-the-ittch-bleni-phis-is-dueto-liecquerel-rays-froji-the-sides-ok-l-he-slecimen-which-fall-on-tpieoutlying-pakts-of-the-plate-plate-iii-image336959639.htmlRM2AG5RCR–. The Becquerel rays and the properties of radium. Photograph of a Welsbach Incandescent Gas Manjxe, TAKEN BY MR. RICHARD KERR. THE MANTLE WAS OPENED IJUT AND LAID FLAT ON A PLATE. IHE EXPOSURE LASTED FOR EIGHT DAYS. THE THORIUM CONTAINED IN THE JMANJ LE MAKES IT RADIO-ACI HE, AND ENABLES IT TO ACT ON THE PLATE. PLATE IT.. Photograi]! of A PIi:CE OF rFi;H-l-ACTIVE, SHOW LIGHT. SLIGHTDARKENING CAN BK SEEN oirrSIDK THE LI.MIT OF THE ITTCH-BLENI) ; PHIS IS DUETO liECQUEREL RAYS FROJI THE SIDES OK l HE SlECIMEN, WHICH FALL ON TPIEOUTLYING PAKTS OF THE PLATE. PLATE III.
. Catalog of portables and shades : year of 1910.. RTED BURNERS /. 3V 4->s 1705 No. 16 Light Complete with No. 16 Welsbach InvertedBurner; Welsbach Inverted Mantle; No.F.Q.M. double-etched air-hole Globe,and 4-inch Gooseneck. No. 16 is particularly adaptable for use oncombination fixtures. By using No. 35 Ring (see Page 40) on theelectric outlets the same style and size glass-ware can be used on both the gas and elec-tric outlets of a combination fixture.Finish: Brushed brass. Prices: 100 lots .Less than /zs 100 lots..%JL&& Each Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/catalog-of-portables-and-shades-year-of-1910-rted-burners-3v-4-gts-1705-no-16-light-complete-with-no-16-welsbach-invertedburner-welsbach-inverted-mantle-nofqm-double-etched-air-hole-globeand-4-inch-gooseneck-no-16-is-particularly-adaptable-for-use-oncombination-fixtures-by-using-no-35-ring-see-page-40-on-theelectric-outlets-the-same-style-and-size-glass-ware-can-be-used-on-both-the-gas-and-elec-tric-outlets-of-a-combination-fixturefinish-brushed-brass-prices-100-lots-less-than-zs-100-lotsjl-each-image336607515.htmlRM2AFHP8Y–. Catalog of portables and shades : year of 1910.. RTED BURNERS /. 3V 4->s 1705 No. 16 Light Complete with No. 16 Welsbach InvertedBurner; Welsbach Inverted Mantle; No.F.Q.M. double-etched air-hole Globe,and 4-inch Gooseneck. No. 16 is particularly adaptable for use oncombination fixtures. By using No. 35 Ring (see Page 40) on theelectric outlets the same style and size glass-ware can be used on both the gas and elec-tric outlets of a combination fixture.Finish: Brushed brass. Prices: 100 lots .Less than /zs 100 lots..%JL&& Each
Crocker-Langley San Francisco directory for the year commencing .. . Gas MachinesBRECK GEO, Davis acetyline genera-tors and supplies, 550-554 Grove Gas MantlesPacific Gas Mantle Co, 541 WallerReliable Self Lighting Gas Mantle541 Waller WELSBACH CO. 351-353 McAUister Gas Meters Pacific Meter Co, Monadnock Bldg Gas Pipe and FittingsMONTAGUE W W & CO, SV cor Turk and Polk 1664- HOWARD STSAN FRANCISCO CAL SHE MAINOFFICEAND WORKS ZIipSI Jessie St. ABOVE FIRST ST. USEINKS PIONEER AUTOMOBILE CO OLDSMOBILE THOMAS FLYER THOMAS 40 PARK 691 901-925 GOLDEN GATE AVE. 1852 GAS CROCKER-LANGLEY HRECTORY GLA Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/crocker-langley-san-francisco-directory-for-the-year-commencing-gas-machinesbreck-geo-davis-acetyline-genera-tors-and-supplies-550-554-grove-gas-mantlespacific-gas-mantle-co-541-wallerreliable-self-lighting-gas-mantle541-waller-welsbach-co-351-353-mcauister-gas-meters-pacific-meter-co-monadnock-bldg-gas-pipe-and-fittingsmontague-w-w-co-sv-cor-turk-and-polk-1664-howard-stsan-francisco-cal-she-mainofficeand-works-ziipsi-jessie-st-above-first-st-useinks-pioneer-automobile-co-oldsmobile-thomas-flyer-thomas-40-park-691-901-925-golden-gate-ave-1852-gas-crocker-langley-hrectory-gla-image340247496.htmlRM2ANFH48–Crocker-Langley San Francisco directory for the year commencing .. . Gas MachinesBRECK GEO, Davis acetyline genera-tors and supplies, 550-554 Grove Gas MantlesPacific Gas Mantle Co, 541 WallerReliable Self Lighting Gas Mantle541 Waller WELSBACH CO. 351-353 McAUister Gas Meters Pacific Meter Co, Monadnock Bldg Gas Pipe and FittingsMONTAGUE W W & CO, SV cor Turk and Polk 1664- HOWARD STSAN FRANCISCO CAL SHE MAINOFFICEAND WORKS ZIipSI Jessie St. ABOVE FIRST ST. USEINKS PIONEER AUTOMOBILE CO OLDSMOBILE THOMAS FLYER THOMAS 40 PARK 691 901-925 GOLDEN GATE AVE. 1852 GAS CROCKER-LANGLEY HRECTORY GLA
. American engineer and railroad journal . ft. and has sliding doors along the whole frontwith slat ventilators over the doors. It has a gravel roof. Dr. Carl Auer von Welsbach, of Vienna, Austria, has beenawarded the Elliott Cresson Medal by the Franklin Institute,for his discoveries regarding the metallic oxides which may be-come incandescent when heated, and for the invention of theWelsbach mantle, by the use of which these metallic oxidesare commercially available £.8 sources of artificial light alf Rear Elevation. tives for freight purposes that are not far from the recentpassenger design Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/american-engineer-and-railroad-journal-ft-and-has-sliding-doors-along-the-whole-frontwith-slat-ventilators-over-the-doors-it-has-a-gravel-roof-dr-carl-auer-von-welsbach-of-vienna-austria-has-beenawarded-the-elliott-cresson-medal-by-the-franklin-institutefor-his-discoveries-regarding-the-metallic-oxides-which-may-be-come-incandescent-when-heated-and-for-the-invention-of-thewelsbach-mantle-by-the-use-of-which-these-metallic-oxidesare-commercially-available-8-sources-of-artificial-light-alf-rear-elevation-tives-for-freight-purposes-that-are-not-far-from-the-recentpassenger-design-image371849429.htmlRM2CGY5MN–. American engineer and railroad journal . ft. and has sliding doors along the whole frontwith slat ventilators over the doors. It has a gravel roof. Dr. Carl Auer von Welsbach, of Vienna, Austria, has beenawarded the Elliott Cresson Medal by the Franklin Institute,for his discoveries regarding the metallic oxides which may be-come incandescent when heated, and for the invention of theWelsbach mantle, by the use of which these metallic oxidesare commercially available £.8 sources of artificial light alf Rear Elevation. tives for freight purposes that are not far from the recentpassenger design
. Elementary chemical microscopy. Microscopy; Microchemistry. 120 ELEMENTARY CHEMICAL MICROSCOPY In the absence of an arc lamp use a 400-watt Mazda lamp with concentrated filament. Or if gas alone is available, employ an inverted Welsbach incandescent mantle or even better an acetylene light. Be sure that the reflecting condenser is high enough in its mounting to just touch the object cell upon the stage. Substage ultracondensers are usually screwed into their tubular mountings and are easily turned up or down to permit of their accurate adjustment. The cardioid ultramicroscope is restricted t Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/elementary-chemical-microscopy-microscopy-microchemistry-120-elementary-chemical-microscopy-in-the-absence-of-an-arc-lamp-use-a-400-watt-mazda-lamp-with-concentrated-filament-or-if-gas-alone-is-available-employ-an-inverted-welsbach-incandescent-mantle-or-even-better-an-acetylene-light-be-sure-that-the-reflecting-condenser-is-high-enough-in-its-mounting-to-just-touch-the-object-cell-upon-the-stage-substage-ultracondensers-are-usually-screwed-into-their-tubular-mountings-and-are-easily-turned-up-or-down-to-permit-of-their-accurate-adjustment-the-cardioid-ultramicroscope-is-restricted-t-image231760418.htmlRMRD1GNP–. Elementary chemical microscopy. Microscopy; Microchemistry. 120 ELEMENTARY CHEMICAL MICROSCOPY In the absence of an arc lamp use a 400-watt Mazda lamp with concentrated filament. Or if gas alone is available, employ an inverted Welsbach incandescent mantle or even better an acetylene light. Be sure that the reflecting condenser is high enough in its mounting to just touch the object cell upon the stage. Substage ultracondensers are usually screwed into their tubular mountings and are easily turned up or down to permit of their accurate adjustment. The cardioid ultramicroscope is restricted t
. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 278 USE OF THE MICROSCOPE A very good artificial light for use with the microscope can be obtained with a Welsbach gas mantle and a balloon flask filled with a light solution of ammoniacal copper sulphate (Fig. 149). Dissolve a very small crystal of copper sulphate in enough water to fill the flask and add ammonia a little at a time until the solution loses all opalescence and becomes perfectly clear blue. Adjust the light and the blue condenser in front of the mic Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/plant-anatomy-from-the-standpoint-of-the-development-and-functions-of-the-tissues-and-handbook-of-micro-technic-plant-anatomy-278-use-of-the-microscope-a-very-good-artificial-light-for-use-with-the-microscope-can-be-obtained-with-a-welsbach-gas-mantle-and-a-balloon-flask-filled-with-a-light-solution-of-ammoniacal-copper-sulphate-fig-149-dissolve-a-very-small-crystal-of-copper-sulphate-in-enough-water-to-fill-the-flask-and-add-ammonia-a-little-at-a-time-until-the-solution-loses-all-opalescence-and-becomes-perfectly-clear-blue-adjust-the-light-and-the-blue-condenser-in-front-of-the-mic-image232360877.htmlRMRE0XJN–. Plant anatomy from the standpoint of the development and functions of the tissues, and handbook of micro-technic. Plant anatomy. 278 USE OF THE MICROSCOPE A very good artificial light for use with the microscope can be obtained with a Welsbach gas mantle and a balloon flask filled with a light solution of ammoniacal copper sulphate (Fig. 149). Dissolve a very small crystal of copper sulphate in enough water to fill the flask and add ammonia a little at a time until the solution loses all opalescence and becomes perfectly clear blue. Adjust the light and the blue condenser in front of the mic
![. Effects of the rays of radium on plants. Plants. Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and Stock Photo](https://c8.alamy.com/comp/RDED5G/effects-of-the-rays-of-radium-on-plants-plants-fig-47a-experiment-60-response-of-chloroplasts-to-radium-rajs-the-sprouting-of-a-potato-was-evidently-not-affected-by-having-the-radium-tube-1500000-x-inserted-into-the-tissue-of-the-tuber-about-10-mm-from-the-quot-eyequot-no-effect-on-germination-followed-an-exposure-of-dry-timothy-grass-seed-for-161-hours-to-the-a-rays-from-a-rod-coated-with-polonium-the-thorium-rays-from-a-welsbach-gas-mantle-retarded-the-growth-of-timothy-grass-when-the-mantle-was-placed-over-the-seeds-germinating-on-the-surface-of-soil-but-germination-and-RDED5G.jpg ". Effects of the rays of radium on plants. Plants. Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and Stock Photo")
. Effects of the rays of radium on plants. Plants. Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and Stock Photohttps://www.alamy.com/licenses-and-pricing/?v=1https://www.alamy.com/effects-of-the-rays-of-radium-on-plants-plants-fig-47a-experiment-60-response-of-chloroplasts-to-radium-rajs-the-sprouting-of-a-potato-was-evidently-not-affected-by-having-the-radium-tube-1500000-x-inserted-into-the-tissue-of-the-tuber-about-10-mm-from-the-quot-eyequot-no-effect-on-germination-followed-an-exposure-of-dry-timothy-grass-seed-for-161-hours-to-the-a-rays-from-a-rod-coated-with-polonium-the-thorium-rays-from-a-welsbach-gas-mantle-retarded-the-growth-of-timothy-grass-when-the-mantle-was-placed-over-the-seeds-germinating-on-the-surface-of-soil-but-germination-and-image232042988.htmlRMRDED5G–. Effects of the rays of radium on plants. Plants. Fig. 47a. Experiment 60. Response of Chloroplasts to Radium Rajs. The sprouting of a potato was evidently not affected by having the radium tube (1,500,000 x) inserted into the tissue of the tuber about 10 mm. from the " eye." No effect on germination followed an exposure of dry timothy grass seed for 161 hours to the a rays from a rod coated with polonium. The thorium rays from a Welsbach gas mantle retarded the growth of timothy grass when the mantle was placed over the seeds germinating on the surface of soil, but germination and
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