 . Employment for the microscope : in two parts. Microscopy; Microscopy. Scarborougli Salt.. CheltenbatQ Salt.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. - G. Fig. 230. Fig. 231. § 572. Schliesslich erwähne ich noch, dass auch in diesem Falle die zur Erzeugung von Interferenzerscheinungen nöthigen Bedingungen erfüllt sind. So werden offenbar die Strahlen A B C D und E F G H (Fig. 231) im Bildpunkte von G mit einander interferieren. Die Phasen-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the origina
 . Elementary chemical microscopy . Fig. 140. and measure the amount of displacement of image 00' of a mark at 0 upon the upper surface of the glass slide, the index of DD' refraction n will be found from the equation n = fZFi' Method 1. A Cell and Cover Glass of Known Thickness.— Cement upon an object slide of clear glass a cell whose top and bottom are ground true and parallel. After the cement has hardened, determine the depth of the cell by means of calipers, dial gauge or by means of the micrometer screw of the fine 1 This method is very old and is generally known as the Due de Chaulnes M
 . Employment for the microscope : in two parts. Microscopy; Microscopy. 4^Tnr.^^^, . vrc.'. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Elements of applied microscopy. A text-book for beginners. Microscopy. 56 ELEMENTS OF APPLIED MICROSCOPY. be seen, and if, as more commonly occurs, the light from the paper is the strongest, the object becomes almost invisible. When the illumination is properly balanced, both object and paper should be clearly seen, and the point of a pencil on the paper may be made to trace the outline of the object with accuracy. Obviously this. Fig. 27.—Course of Rays in the Camera Lucida. (After Gage.) device, primarily intended as an aid to the making of drawings of microscopic objects, may be used in m
 . Elementary chemical microscopy . tion of the point of incidence upon R of the illuminating rays from the radiant, according to the power and mounting of the objective employed. The light rays proceeding from the radiant pass through the lens L, and striking the surface R, pass through the objective which now acts as a condenser, throwing a tiny spot of intense light upon the surface of a metal preparation M. The light rays reflected from M reenter the objective to form the image seen in the microscope. A noteworthy feature of this type of vertical illuminator is the placing of the prism P in
 . Employment for the microscope : in two parts. Microscopy; Microscopy. JMfn^yc.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 104 Serien schnitten etc. â â von grossem Nutzen sein, die Verschiebung des Präparates rein mechanisch mit Hilfe eines nach vorn und hinten und nach rechts und links hin beweglichen Objecttisches ausführen zu können. So haben denn auch in neuerer Zeit die meisten Mikroskopfirmen derartige bewegliche Objecttische constmiert, die zum Theil einfach auf den gewöhnlichen Objecttisch aufgesetzt werden und somit auch an jedem beliebigen älteren Mikroskop angebracht werden können. Damit nun übrigens die
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. Salto£Milleped.cs^^-^/''H!. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 230 durch starke Kautschukringe fest angepresst. Um einen Luftwechsel zu ermöglichen, ist ferner das Glasröhrchen (z) einer Durchbohrung des oberen Objectträgers eingekittet, die durch die eingeschliffene Rille (i) mit der Luftkammer communiciert. Um auch Trockensysteme benutzen zu können, umgibt man dieselben zweckmässig mit einer conischen Hülse, durch die der Frontfläche des Objectivs ein dünnes Deckglas dicht angepresst wird, oder man kittet 9 in der aus Fig. 176 ersichtlichen Weise auf das betreffe
 . Elementary chemical microscopy .
![. Employment for the microscope : in two parts. Microscopy; Microscopy. Pl.'V]II.;f.i6 Salt of Tobacco .. Salt o£ Mug-wort.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley - Stock Image](https://c8.alamy.com/comp/REX4NP/employment-for-the-microscope-in-two-parts-microscopy-microscopy-plv-iifi6-salt-of-tobacco-salt-o-mug-wort-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-baker-henry-1698-1774-london-printed-for-r-and-j-dodsley-REX4NP.jpg) . Employment for the microscope : in two parts. Microscopy; Microscopy. Pl.'V]II.;f.i6 Salt of Tobacco .. Salt o£ Mug-wort.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 346 MANirULATION. slender shaft of wood, b, whilst the other is curved as at c, in order to be pressed upon by the thumb or fore-finger in the act of cutting. With an instrument of this kind, Swammer- dam is said to have made all his finest dissections. Method of Sharpeninc/ Scissors.—This may be effected by opening the blades and noticing the angle at which the edges have been previously ground, and placing them on
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. TJateOl Green "Vitriol.. "Wliite "Vitriol.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. PEACTICAL TREATISE ON. power was increased by draw tubes from 40 to 140 times. The latter, S. Campani of Bologna, was also a maker of telescopes and microscopes, and a successful rival of the former, his instrument was somewhat similar to that made by Divini, being on the principle of an inverted telescope. Campani'a lenses are said to have been worked on a turn-tool, and not moulded. In 1672, we find that S. P. Salv
 . Elementary chemical microscopy . t ^v&
 . Employment for the microscope : in two parts. Microscopy; Microscopy. "Verdig-reafe diftilled. A V 9).SMaL^ M.^.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Cursus der normalen Histologie zur Einführing in den Gebrauch des Mikroskopes, sowie in das practische Studium der Gewebelehre. Histology; Microscopy. Die Bindesubstanzen. 117 Zellen sollen später noch besonders untersucht werden. ^lan färbp mit Anilin- violett (5 Minuten) und lege in Kali acet. ein. 6. Netz eines Embrj^o (Fig. 31 Ã). Aehnliche Verhältnisse wie bei 5.. nur noch relativ reichlichere Zellen; alle mit diclfem protoplasmatischem. Fig. M. 0 m e n 111 ni in der E n t x i c k c 1 u n g. .. Vom Neugeborenen, combinirte Färbung von Osmiumsaurc iiiirl Anilinviolett; g. ein sich
 . Elementary chemical microscopy . FlG "5-
 . Employment for the microscope : in two parts. Microscopy; Microscopy. 226 Mtfcellaneoiis Ohfervat'ions on Saks, he* that the Figures they produce are diflinguiJJj- ing and injallibk Marks of their different Degrees of Perfedion, and that the Micro- scope may be of the utmoft Service to dif- cover Knavery and Impoiition, End of P A RT the Fir ft.. ADVERTISEMENT. S many of the Curious, who defire to keep Solutions of Salts in Readinefs for Examination, may chufe to fave them- felves fome Trouble; Mr. Cuff, Optician, againfl Serjeants-Inn Gate in Fieet-Jireet, can furnifli them with Boxes of di
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ILLUSTKATOES. 205 on the last one, D, by means of the lever, F. The illuminator itself consists of a portion of a large thick lens, such as that represented by G, as being cut off from H. In order to explain its action the course of three rays of light, ah c, is represented: these rays, on reaching the first surface, are ren- dered slightly convergent; on meeting with the plane surface they are reflected at right ang
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. M^^"" Chriftals.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 162 § 151). Bei einem derartigen Mikroskope wird natürlich bei einer Drehung* ausser dem Objecte gleichzeitig auch die Orientierung des auf dem 0ciliar befindlichen Analysators geändert. Es wurde übrigens von Y. v. Ebner (I, 161) ein Halter construiert, der an dem Fuss des Mikroskops befestigt wird und den oberhalb des Oculars befindlichen Analysator derartig festhält, dass eine Drehung desselben beim Drehen des Tubus verhindert wird. Die Anwendung dieses Apparates macht allerdings ein Centrieren ganz ü
 . Elementary chemical microscopy . Ocular
 . Employment for the microscope : in two parts. Microscopy; Microscopy. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
![. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 137.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ] - Stock Image](https://c8.alamy.com/comp/PG43JM/a-practical-treatise-on-the-use-of-the-microscope-including-the-different-methods-of-preparing-and-examining-animal-vegetable-and-mineral-structures-microscopes-microscopy-fig-137-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-quekett-john-1815-1861-london-h-bailliere-etc-etc-PG43JM.jpg) . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 137.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ]
 . Elementary chemical microscopy . '.'..^â ,i'.t,,', ,','.'.^,v ', .â lvyl'.','.',r' v ' ' ^ 11 ' ' i 'A jn^l. Fig. 34. Nachet Vertical Illuminator.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. VIU PREFACE He begs Pardon of the Phyjicians end Che- f}nftsi for encroaching now and then on thdf Province^ in the Courfe of the following Ob- fervations and Remarks; and hopes they will generoujly txctfe any Mijlakes he may have fallen intOy as he is neither Phyfcian nor Che- tnijl. Thofe too who are themfelves well ac- quainted with the Subjects here defrribed, wiH noti he hopes, be difpleafed at his endeavouring to injlruBfuch as know them not, lie acknowledges his Obligations to many ingenious Friends, who have favour
 . Elements of applied microscopy. A text-book for beginners. Microscopy. FUNCTION AND PARTS OF THE MICROSCOPE. 7 the lens, though of course less so than before {A, Fig. 6). No real image can therefore be formed by an object lying inside the principal focus. Rays from a point out- side the principal focus have an initial divergence so small as to be entirely overcome by the lens. Such rays (C,. Fig. 6.—Course of Rays according to the Relation of a LuMmous Point to the Principal Focus. Fig. 6) will actually converge after passage through the lens and will meet at a definite point to form a real
 . Elementary chemical microscopy . Fig. 92. Microscope Lamp; Spencer Lens Co. Arc Type.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. INDEX. Cafes of People poyfoned by it Experiments to know it Fumes how pernicious ^ives a Silver Colour to Copper AJh Tree, Infefts on the Bark of. juration and Repulfion fuppofed greatly inftrumental in the Configurations and Cryftals of Salts, &c. 27, 48 Alternate Fits of each '^ 27,29 Queries concerning , 26, &c. B. IBag'Animal, or, Fediculiis Aquatkus y â 383 Bavflkklc, or Prkkk-back, Loufe of â â >, ,. 377 Bark (Peruvian) examined -â^ 171 Bat, the Loufe of »....» n 406 Baulvt, Salt of ,Lii .1 'â « «»&g
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 118 PRACTICAL TREATISE ON THE MICROSCOPE. object-glass; the cap is then removed and the object placed on the stage, and the light obtained from a white cloud or bright sky, using the plane mirror; the reflector is then moved to or fro till the object is best illuminated. The rays of lamp or candlelight must be rendered parallel, by means of the large planoconvex lens or condenser, placed with its flat side near to th
 . Elementary chemical microscopy . Fig. 142. Isotropic and Anisotropic Crystals between Crossed Nicol Prisms.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. Salt of Tobacco .. Salt o£ Mug'wort.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 97 4. Die Dunkelfeldbeleuchtung. § 139. Bei der sogenannten Dunkelfeldbeleuchtung erscheinen die im Präparat befindlichen Objecte hell auf dunklem Grunde, was z. B. bei der Auffindung und Verfolgung kleiner Organismen oder dergl. viel- fach von Vortheil sein kann. Ferner kann die Dunkelfeldbeleuchtung auch bei der Mikrophotographie in manchen Fällen gute Dienste leisten. Das Princip der Dunkelfeldbeleuchtung beruht darauf, dass alle Strahlen, die von dem betreffenden Objective aufgenommen werden, durch
 . Elementary chemical microscopy . Fig. 46. Stead Works Micro- scope. Fig. 47. Tassin Metallurgical Microscope. As indicated by the name and purpose they are compact, sub- stantially built and easily transportable. They consist essen- tially of a compound microscope, whose pillar or handle arm has been separated from the remainder of the instrument in a line in the plane of the stage, and attached to a suitable base or to three legs. In other words, these instruments are microscopes without stage or substage. When in use, the base rests upon the object to be studied and the tube carrying objec
 . Employment for the microscope : in two parts. Microscopy; Microscopy. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 189 Abbe'schen Beleucbtungsapparates angebracht und besteht in der Haupt- sache aus dem mit Hilfe der Schraube s2 beliebig enger oder weiter zu stellenden Spalte (Sp), der Collimatorlinse C, den beiden Prismen Px. Fig. 128. und P2 und der das Spectrum in die Objectebene projicierenden Linse 0. Die Schraube s1 dient schliesslich dazu, durch Verschiebung des Spaltes eine ganz bestimmte Spectralregion in das Gesichtsfeld zu bringen. Das Spectrum ist übrigens in diesem Falle so ausgedehnt, dass bei stärkere
 . Elementary chemical microscopy . Fig. 70. Attachable Mechanical Stage. changing the distance between F and /, thus providing for the use of object slides or cells of different sizes. A more convenient form of removable mechanical stage is shown in Fig. 71. In this type a narrow slot is cut into the micro- scope stage. The opening thus made is provided with beveled grooves at the sides, into which slips a sliding metal plate pro- vided with coordinate movements, M. When a perfectly plain stage is wanted the mechanical stage is removed and a plain black metal plate, P, is inserted in its place
 . Employment for the microscope : in two parts. Microscopy; Microscopy. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. ACCESSORY INSTRUMENTS. 135 sary, the entire quantity must be dropped into a watch glass, which spreads it, and the insect may be again caught by putting the tube over it, when a small quantity of fluid is sure to run in by capillary attraction; this small quantity is to be placed upon the tablet; but should there be still foo much for the tablet, if it be touched with the tube again, it wUl be diminished; and should
 . Elementary chemical microscopy . Fig. 129. Hemacytometer Cell. X15. Turk rulings. Fig. 130. Hemacytometer Cell. X15. Zappert-Neubauer rulings. When it is desirable to cover a definite area on the object slide it is far better to employ a micrometer disk-diaphragm properly calibrated and inserted into the eyepiece or to cut a square opening in a disk of dull black paper, thin card, meta' or blackened mica, and drop the disk into the proper eyepiece by removing the eye-lens and allowing the disk to rest upon the diaphragm of the eyepiece. The proper size of opening is ascer- tained by eyepiece
 . Employment for the microscope : in two parts. Microscopy; Microscopy. ^ E/y-/vr J. ^fj/n^ tfci/fjtf.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Cursus der normalen Histologie zur Einführing in den Gebrauch des Mikroskopes, sowie in das practische Studium der Gewebelehre. Histology; Microscopy. Präparations- und Härtungsmethock'U. 49 gibt. Sie unterscheiden sich von den anderen dadurch, dass hei ihnen das zu schneidende Präparat durch eine Kältemischung oder durch Verdampfen von Aether (s. Fig. 15) auf einer unehenen verschiebbaren Unterhige festfriert. Damit das Gefrieren rasch ge- schieht, schneidet man von dem Präparate eine ca. 2 Mm. dicke. Fig. 15. Giefriermikrotora von U. Jung (Heidelberg). A Platte, auf welche die Präparate ge
 . Elementary chemical microscopy . Fig. 86. Burner for Microchemical Analysis. Fig. 87. Burner for Microchemical Analysis. (Xi) only moderate heating of very small amounts of material. Since, however, microchemical methods often require a preliminary handling of several grams or cubic centimeters of substance, the burner shown in Fig. 87 will be found to afford a wider range of usefulness. It also occupies less space upon the work table. It consists of an ordinary Bunsen burner provided with a side- tube for a " reserve " or " pilot " flame. In the form illustrated,
 . Employment for the microscope : in two parts. Microscopy; Microscopy. EMPLOYMENT FOR THE Microscope, &c. CHAP. I. Concerning lie CoKTiGVRATiot^s andCRY" ST also/Salt sands ALiiiESvBSTANCES.. 'S I wifh nothing more hearti- ly than the real Advance- ment of ufeful Knowledge, by difcovering, as far as pof- fible> the Operations of Na- ture in the Formation of Bodies, and their Effedls on one another : and as the moft reafonable Way of account- ing for their EfFed:s muft arife from a Dif- covery and confideration of the Figure, §ize> Solidity, Weight and Motion, of their B con-. P
 . Elements of applied microscopy. A text-book for beginners. Microscopy. PETROGRAPHY AND METALLOGRAPHY. 167 homogeneous substance made up of ciystalline needles easily distinguished from any other constituents of steel. The exact amount of carbon in steel must be deter-. FiG. 60.—Microscopic Appearance op Steel with 1.5% Carbon (Pearlyte and Cementite), (After Sauveur.) mined by chemical methods; but the presence of the mineral forms we have discussed and the manner in which they are associated can only be ascertained under the microscope. Furthermore, the crystals present may be abnormally ar
 . Elementary chemical microscopy . HANDLING SMALL AMOUNTS OF MATERIAL: SUBLIMATION 291 of a hot stage such as that described on page 222 or by the method recommended by A. W. Blyth.1 A small porcelain crucible is nearly filled with mercury, into which dips the bulb of a ther- mometer. A thin cover glass, bearing at its center the material to be tested, moistened and dried as usual, is floated on the surface of the mercury. Upon the cover glass is placed a low glass cell whose upper and lower rims are accurately ground. A second cover glass is placed above to receive the film — see diagram, Fig
 . Employment for the microscope : in two parts. Microscopy; Microscopy. I N D E X. ConJTSIures concerning Amber i^O to 146 Configurations and Cr^J}aliz,ations how different â q luppolcd owing 10 Aitradion and Rcpulfioti 29. 46 not to X'^egetation 41 Gems formed in the fame Manner 43 Copper ParliclcG how attracted by Iron 78, 82, 196 to 208 obtained pu:e by iuch Attradion 80 gives Colour to Gems â * 8z Experiments on its Colours 83 its Colour how diflufible â 84. Branchings of it to produce 195 to preferve 20^ Copperas., fee Vitriol (green) Corals and Corallines^ Conjedlures about their Formati
![. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. IjK u jUilK^H^ g^i 1 i iPi IB 1 1. Fig. 226. :e £ plant, and a transverse section of a portion of the same mag- 22*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ] - Stock Image](https://c8.alamy.com/comp/PG43F3/a-practical-treatise-on-the-use-of-the-microscope-including-the-different-methods-of-preparing-and-examining-animal-vegetable-and-mineral-structures-microscopes-microscopy-ijk-u-juilkh-gi-1-i-ipi-ib-1-1-fig-226-e-plant-and-a-transverse-section-of-a-portion-of-the-same-mag-22-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-quekett-john-1815-1861-london-h-bailliere-etc-etc-PG43F3.jpg) . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. IjK u jUilK^H^ g^i 1 i iPi IB 1 1. Fig. 226. :e £ plant, and a transverse section of a portion of the same mag- 22*. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ]
 . Elementary chemical microscopy . Fig. i 6. Fig. i 8. Fig. 17. Methods of Reducing Numerical Aperture of Objectives for Dark-field Studies. (D, D, D, Removable Diaphragms.) purchased. Diaphragms for use with objectives in dark-field studies are generally supplied by the manufacturers of reflecting condensers for introduction into the special objectives to be used. These funnel-like diaphragms are not interchangeable and can be employed only for the objectives for which they are designed. Figs. 16, 17 and 18 show three different types and forms of dia- phragms employed for this purpose. In the
 . Employment for the microscope : in two parts. Microscopy; Microscopy. £-J^.>l^k,r d^. Salt ofAVbrmwoocL.. Salt of liaveiider.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. 252 USE OF THE MICEOSCOPE. remove many of the difficulties incident to the instruments heretofore in use, is represented in figs. 159 to 167. Amongst the peculiar advantages of this instrument may be enumerated its capability of measuring opaque and imperfect crystals, also microscopic crystals, and crystals in the interior of transparent media. It is equally apphcable to the largest crystals, and will measure angles
 . Elementary chemical microscopy . Fig. 59- The Ultramicroscope of Cotton & Mouton.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. INDEX. A. ACID (volatile Spirit,) what its Effeas ^.7/c/u of Animals, an expreflive Language J^lum examined âââ â its Cor.f.gurations when excited by Heat its Cryfials when at Reft. produces Comet-like Figures > . q^ how to preferve â , «. j^^ how produced . , j^. Earth from Africa ... y^ -â ^//j^^r (Salt of) examined ⢠â j^g its Gen-raiion uncertain - -Mq where found â _ j^q Queries concerning it ââ. j.g InlCifls how fappofed to get inrc it - , ,- >/w/«o«i<7r (Salt) defcribed ââ ..â ^^^ examined by he Microfc
 . Cursus der normalen Histologie zur Einführing in den Gebrauch des Mikroskopes, sowie in das practische Studium der Gewebelehre. Histology; Microscopy. 288 Die Oi-o'ane. liehen aus baumförmig verästelten Zotten, an w^elcheii man einen l)indeg'ewebigen, gefässführenden Grundstock und einen epithelialen üeberzug unterscheidet. Die Gefässc sind an älteren und beson- ders an ausgetragenen Placenten so reichlich, dass nur wenig Raum für das Bindegewebe übrig bleibt, welches in jüngeren Placenten dem Schleimo;ewebe angehört, später auch Fasern enthält, aber. Please note that these images are extrac
 . Elementary chemical microscopy . Fig. 149. Behrens Method of Filtration. A little practice is required in order to apply the proper pressure of the glass tube upon the filter paper and to maintain this pressure uniformly without tipping the tube out of its vertical position. The chief difficulties encountered in rapid work are: (1) The danger of carrying the filtrate up into the mouth or into the rubber tube by air bubbles, which are always drawn into the tube when the liquid to be filtered has all been absorbed by the filter paper and sucked into the tube, and (2), it not infrequently happe
 . Employment for the microscope : in two parts. Microscopy; Microscopy. IBlew Vitriol.. TJateOl Green "Vitriol.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. CIRCULATION OF THE BLOOD. 369 which are shown hj g gi ff, in order to keep the web open, or what answers better is a series of pegs of the shape repre- sented by h, each having a slit, i, extending more than half way down It; the threads are wound round these two or three times, and then the end is secured by putting it into the slit, i. The plate is now ready to be adapted to the stage of the microscope; the square
 . Elementary chemical microscopy . Wire
 . Employment for the microscope : in two parts. Microscopy; Microscopy. Glaubers Salt. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. in welche mit Kochsalz getränkte Papierbäusche gebracht werden. Von diesen Papierbäuschen wird denn auch ein zweites Deckglas (1) gehalten, das den die Objecte tragenden Tropfen nach unten hin abschliesst. § 385. Eine ausgedehnte Anwendung haben die unpolarisierbaren Elektroden ferner bei den Verworn'sehen Untersuchungen über die Galvanotaxis der niederen Organismen gefunden. Um zunächst die Orte, in denen der elektrische Strom in die Elüssigkeit ein- und austritt, beliebig variieren zu können, benutzt
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. ¥ffi4ft>- V.F.MakerM. '•vi.5;> Fu/X[T. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 93 als die Brennweite. Nehmen wir nun aber z. B. einmal an, class sich der Brennpunkt des Hohlspiegels (Fig. (39) in F befindet, so würde nach § 128 der durch den Hohlspiegel von dem Punkte 0 entworfene Bild-. Fig- 69. punkt in Ox liegen und somit bedeutend mehr von der Spiegelfläche entfernt sein, als der von dem Planspiegel entworfene Bildpunkt 02. Aus dieser Lage der dem Objectpunkt zugeordneten Punkte folgt nun unmittelbar, dass der von dem Diaphragma bb gestattete Oeffnungs- winkel A 0 B bei Anwend
 . Elementary chemical microscopy . Fig. 113. Beck Micrometer Microscope. of one division on the scale of the stage S2. The object to be studied is placed upon the section S 1 of the stage and clamped in place, the stage S having been first moved by hand by the knob K to the most convenient place for beginning the measurements.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. jieiv. /^<i.'i8. Salt of Lead. llowers oi'Antimony. Salt of Tin.. Ens Veneris. Corrofive Sublimate.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Elements of applied microscopy. A text-book for beginners. Microscopy. FiG. 54.—Crystals of C-esidm Alum. (After Lehmann.) phate. From dilute acid solutions slender monoclinic prisms of the compound (CaS04+ 2H2O) crystallize out. Fig. 55.—Crystals of Calcium Sulphate. (After Lehmann.) (Fig. 55), showing numerous double twins, as at C, and in presence of strong acids, masses of minute needle- like crystals, as at .4.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. 'PUi/,u,.jSS. iHll,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. power was increased by draw tubes from 40 to 140 times. The latter, S. Campani of Bologna, was also a maker of telescopes and microscopes, and a successful rival of the former, his instrument was somewhat similar to that made by Divini, being on the principle of an inverted telescope. Campani'a lenses are said to have been worked on a turn-tool, and not moulded. In 1672, we find that S. P. Salvetti made micro- scopes
 . Elementary chemical microscopy . Fig. L33- Fractional Distillation of a Volatile Liquid. (Full size.) A more universally applicable distilling tube is shown in Fig. 156. It consists essentially of a tiny tubulated retort with attached receiver. The liquid is introduced through the side arm which is then closed with a tiny plug of cork or rubber or by fusing. Upon heating the liquid the vapors pass down the nar- row inclined tube, are condensed and collected in the rounded receptacle. To prevent loss the narrow tube between retort and receiver may be wound with wet filter paper. The distillat
 . Employment for the microscope : in two parts. Microscopy; Microscopy. .^'f^jxiv: v^"^ fxr. 11 ,^ *y.%yiCu4tcltJc. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. E, Es Fig. 6. selben zunächst den der Achse parallelen Strahl, der nach obigem durch den Brennpunkt F2 geht; auf dieser Geraden muss also jedenfalls die ge- suchte Abbildung von Px liegen. Zur eindeutigen Bestimmung derselben haben wir nur noch nöthig, durch den Punkt Px einen zweiten Strahl hindurchzulegen und auch für diesen die Abbildung zu ermitteln. Wir wählen hierzu den durch den ersten Brennpunkt (Fx) gehenden Strahl (P-t Fj, dieser geht nach obiger Definition im zweiten Medium der Achse parallel
 . Elementary chemical microscopy . PLATE I. Optics of the Compound Microscope.1 Fi Upper focal plane of objective. F2 Lower focal plane of eyepiece. A Optical tube length = distance between Fi and F2. Oi Object. 02 Real image in F2 transposed by collective lens. 03 Real image in eyepiece diaphragm. 04 Virtual image formed at the projection distance C, 250 mm. from EP. EP Eye-point. CD Condenser diaphragm. L Mechanical tube length (160 mm.). 1, 2, 3 Three pencils of parallel light coming from different points of a distant illuminant. 1 From " The Microscopy of Drinking Water " by Geor
 . Employment for the microscope : in two parts. Microscopy; Microscopy. J). /;. /< 1. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
![. A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 69.. Fig. 70.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ] - Stock Image](https://c8.alamy.com/comp/PG43WH/a-practical-treatise-on-the-use-of-the-microscope-including-the-different-methods-of-preparing-and-examining-animal-vegetable-and-mineral-structures-microscopes-microscopy-fig-69-fig-70-please-note-that-these-images-are-extracted-from-scanned-page-images-that-may-have-been-digitally-enhanced-for-readability-coloration-and-appearance-of-these-illustrations-may-not-perfectly-resemble-the-original-work-quekett-john-1815-1861-london-h-bailliere-etc-etc-PG43WH.jpg) . A practical treatise on the use of the microscope, including the different methods of preparing and examining animal, vegetable, and mineral structures. Microscopes; Microscopy. Fig. 69.. Fig. 70.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Quekett, John, 1815-1861. London, H. Bailliere; [etc. , etc. ]
 . Elementary chemical microscopy . Fig. 14. Types of Dark-field Illuminators. A. Nachet et Fils. B. Reichert. C. Bausch & Lomb. D. E. Leitz. The Beck illuminator is unique in that it permits adjustment for different thicknesses of object slides, an impossiblity with other forms of paraboloid illuminators. This adjustment for slide thickness is accomplished by changing the distance between the focusing lens L and the para- boloid P. As seen in the diagram, the illuminator consists of two parts, the paraboloid mounting screwing into that which holds the lens; therefore raising or lowering th
 . Employment for the microscope : in two parts. Microscopy; Microscopy. ". 77^ Plate I/./^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Cursus der normalen Histologie zur Einführing in den Gebrauch des Mikroskopes, sowie in das practische Studium der Gewebelehre. Histology; Microscopy. Die Bindesubstanzen. 155 derselben gewisse Eigenthümlichkeiteii hervor, welche auf die ge- nannte Metamorphose hinweisen. So ist vor allen Dingen niemals zwischen den Osteoblasten und der Knochenoberfläche ein solches Verhältniss, wie wir es z. ß. an einem Epithel und seiner Unter- lage zu sehen gewöhnt sind, es tritt vielmehr die enge Beziehung, welche zwischen beiden besteht, schon an dem Umstände hervor, dass immer ein Theil der Zellen mehr
 . Elementary chemical microscopy . Fig. 26. Microscope with Large Stage for the Rapid Examination of Powdered Material. is of great assistance.1 The material is thinly spread out upon the plate glass stage, and the microscope is made to pass by means of the screws S and R over the entire area covered by the material. A very low power L is first employed until some particle is found, needing to be studied more carefully. The par- ticle is centered under the lens, L is then removed and the com- pound microscope M slipped in place in the same slot previously occupied by L. The particle in questio
 . Employment for the microscope : in two parts. Microscopy; Microscopy. /. 'W//u/<r . fr/f^.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 170 die Strecke von dieser unterscheidet. Da nun aber nach Obigem, wenn wir die Dicke der anisotropen Platte continuierlich wachsen lassen, auch eine continuierliche Zunahme jener Phasendifferenz eintritt, so erhalten wir nach § 58 einen stetigen Wechsel von Hell und Dunkel, und zwar liegen die Helligkeitsmaxima für parallele Nicole bei einer Phasen- differenz von X oder einem Vielfachen von X, bei gekreuzten Nicoin bei einem Phasenunterschied von — oder einem ungeraden Vielfachen von —. Li Li Stellt
 . Elementary chemical microscopy . FlG. 44. Reichert-Holz Metallurgical Microscope arranged for photography under low magnifications with axial illumination.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. Fiar. 63. mit Hilfe eines Glasstabes (s) clirect auf das 'zu.beobachtende Object hingeleitet. Dieser Glasstab ist zu dem Zwecke derartig gebogen, dass das Licht durch totale Reflexion an den Wänden fortgeleitet wird. In der That liefert tin derartiger Glasstab, wenn sein unteres Ende unmittelbar unter den Objectträger gebracht wird, einen ziem- lich gieichmässigen Be- leuchtungskegel von be- trächtlicher Ausdehnung, der durch Aufsetzen von Blendungen beliebig ein- geschränkt werden kann. Immerhin ist di
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. Sal Tolyclirestum.. Glauber's Salt.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Cursus der normalen Histologie zur Einführing in den Gebrauch des Mikroskopes, sowie in das practische Studium der Gewebelehre. Histology; Microscopy. Lp. Fig. 72. Se h wei iie leber, ein Acinus im Querschnill; einer im nicht ganz reinen Längsschnitt die anstüssenden nur ai gedeutet; v. h. Vena hepatica, v. p. Vena portae, a. Arteria hepatica, b. das Bindegewebe zwischen den Aeiuis. -"/,. darstellt. Durch Combination beider erhält man eine Vorstellung von der vollständigen Gestalt des Läppchens, welches ein mehr- seitiges, an einem Ende kuppenförmig gestaltetes Prisma bildet, von welche
 . Elementary chemical microscopy . Fig. 128. Girard Counting Cell for the Analysis of Flour. not always clear when the particles to be counted are in focus; the relatively large size of the ruled squares with a high power; 1 Made by Nachet et Fils, Paris, France.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. ty'^xir. ^'vf'xm:. -m^ tX^l^dt/c.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Das Mikroskop. Ein Leitfaden der wissenschaftlichen Mikroskopie. Microscopy; Microscopes. 1G7 stehen, die ferner, wie aus der Gleichheit der Winkel pCk und pCg (beide = 45°) hervorgeht, die gleiche Amplitude, resp. Intensität besitzen. Diese beiden Strahlen werden nun aber den anisotropen Körper den Differenzen der optischen Elasticität entsprechend mit ungleicher Geschwindigkeit und Wellenlänge durchsetzen, und zwar sind beide den betreffenden Brechungsindices umgekehrt proportional. Sind also nt und n2 die Brechungsindices für die in Luft gemessene Wellenlänge, so er- hält man als Wellenlä
 . Elementary chemical microscopy . Cover-glass and Slide Gauge. - - In dark-field illumination it is necessary to employ the proper slide thickness for which the reflecting condenser has been designed. So too when using high-power dry objectives, especially those with correction col- lars, it is necessary that we ascertain the thickness of the cover- glass and correct for this thickness either by means of the cor- rection collar of the objective or by lengthening or shortening the draw tube as the case may require. The most satisfactory gauge with which the author is familiar is shown in Fig.
 . Employment for the microscope : in two parts. Microscopy; Microscopy. M^^"" Chriftals.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
 . Cursus der normalen Histologie zur Einführing in den Gebrauch des Mikroskopes, sowie in das practische Studium der Gewebelehre. Histology; Microscopy. 72 Einleitung.. Fig. 18. Balsamflasche mit übergreifendem eingescliliffe- :iem Stöpsel und Glasstab; in verschiedenen Grössen käuflich. schliffenen Stöpseln (Fig. 18), Von sonsti- gen Glasgefässen bedarf man einiger Eeagir- gläser, einiger Kochkolben, einer Anzahl grösserer Präparatengläser mit eingeschliife- nen Stöpseln, eines graduirten Cylinders, einer Spiritiislampe, einiger grösserer Fla- schen (sog. Spiritusflaschen) und einer Q(ian- ti
 . Elementary chemical microscopy .
 . Employment for the microscope : in two parts. Microscopy; Microscopy. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Baker, Henry, 1698-1774. London : Printed for R. and J. Dodsley
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