. 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

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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

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