S3& Scientific American i\U^£M£/.Ji S8Jj 19Ui … A. Six or more are ordinarily used. SENSITIVE LABORATORY BALANCE. HOW TO MAKE AN ELECTRICAL sary is scraped to a bearing. Circulars on application. By N. Monroe Hopkins. This "built-up" laboratory Massachusetts Tool Co., 50 W )U St., Greenfield, Muss. Furnace for Amateur's Use.—The utilization of…
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