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 43
y copper wires, C. The connections should all be soldered to • suits, as the voll very low and the resistance of an un- d joint would ^t<>]> the current.The heat may he supplied by an al-cohol lamp or other device and thecurrent may then he detected byimple galvanometer con-sisting i.f a… … Thermo Battery are heated and the circuit completedthe needle will swing around it atright angles to the coils of wire. Ap-plying ice or cold water to the nailheads will reverse the current.—Con-tributed by A. C. A., Chicago. POPULAR MECHANICS FOUNDRY WORK AT HOME Part Il-How to Make a Mold Having…
Handicraft · Amusements
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