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. Scientific American Volume 86 Number 13 (March 1902). SENSITIVE LABORATORY BALANCE. By N. Monroe Hopkins. This built-up* laboratorybalance will weigh up to one pound and wilt turn with aquarter of a postage stamp. The balance can be madeby any amateur skilled in the use of t«ols, and it willwork as well as a $125 balance. The article is accom-panied by detailed working drawings showing variousstages of the work. This article is contained in Scien-tific American Supplement, No. 11S4. Price 10cents. For sale by Munn & CO.. 361 Broadway, NewYork City, or any bookseller or newsdealer. TOOLS FOR

. Scientific American Volume 86 Number 13 (March 1902). SENSITIVE LABORATORY BALANCE. By N. Monroe Hopkins. This built-up* laboratorybalance will weigh up to one pound and wilt turn with aquarter of a postage stamp. The balance can be madeby any amateur skilled in the use of t«ols, and it willwork as well as a $125 balance. The article is accom-panied by detailed working drawings showing variousstages of the work. This article is contained in Scien-tific American Supplement, No. 11S4. Price 10cents. For sale by Munn & CO.. 361 Broadway, NewYork City, or any bookseller or newsdealer. TOOLS FOR Stock Photo
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Reading Room 2020 / Alamy Stock Photo

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2CEWA3A

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7.1 MB (181.6 KB Compressed download)

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2271 x 1100 px | 38.5 x 18.6 cm | 15.1 x 7.3 inches | 150dpi

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. Scientific American Volume 86 Number 13 (March 1902). SENSITIVE LABORATORY BALANCE. By N. Monroe Hopkins. This built-up* laboratorybalance will weigh up to one pound and wilt turn with aquarter of a postage stamp. The balance can be madeby any amateur skilled in the use of t«ols, and it willwork as well as a $125 balance. The article is accom-panied by detailed working drawings showing variousstages of the work. This article is contained in Scien-tific American Supplement, No. 11S4. Price 10cents. For sale by Munn & CO.. 361 Broadway, NewYork City, or any bookseller or newsdealer. TOOLS FOR MECHANICS. Send for Free Catalogue No. 16 B. The L. S. Starrett Co., Athol, Mass., U. S. A.. Asbesto- Metallic Packings SHEETING, GASKETS. TAPE and PISTON PACKINGS.Will stand the highest pressure for either steam orhydraulic work. $&~* Write /•»• samples and price list. C. W. TRAINKU MFG. CO., (Est. 1871). 88 1wrl St.. liustoa, U. S.A If Yon Will Send Us 25c. postage and full explanation oftroubles you have with your gas or gasoline engine of any make, wewill give you the benefit ot our thirteen years experience in a specialletter advising remedifs. Harty Motok Co., Ltd., Port Huron, Mich. PROSPECTIVE BOAT BUYERS. By constructing your boatfrom a set of my BoatBuilding Materials morethan one-half the boat fac-torys price can be realized.Also economize freight 500percent. Launches, Sail andRow Boats, Gasoline En-gines. Catalog free.FRED MED ART. 3545 DeKalb St., St. Louis, Mo

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