Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 26
HOW TO MAKE A GALVANOSCOPE A galvanoscope for detecting small cur-rents of electricity can be made from acoil of wire. A; a glass tube. B. full ofwater: a core, C; and a base. D. with bind-ing posts as shown. The core C, which ismade of ironand cork is atrifle lighterthan the wa-ter it displac-es… … Pres. Carleton Kinney rat rights; Chief EngineerInnes Kinney (left) through the coil, the core is drawn downout of sight. The current required is verysmall as the core is so nearly balancedthat the least attraction will cause it tosink. The glass tube may be a test rube as POPULAR MECHANICS shown…
Handicraft · Amusements
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