Electric toy making for amateurs. This work treats on the making of electrical toys, electrical apparatus, motors, dynamos and instruments in general ... By T. O'Conor Sloane .. (1914)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · New York, The N.W. Henley publishing co. · leaf 163
ut y2 inch in diame-ter and about the same in height, with a hole drilleddown through the center and a conical indentationon one side, as shown. 162 ELECTRIC TOY MAKING. A screw is passed down through the center holeof each of the large carbons by which they are se-cured to a cigar box as a… … Fig. 69. Carbon Microphone. lightly in the conical indentations of the pair ofi/o-ineh carbons, as shown. As in the former instance, the battery and tele-phone receiver are placed in circuit with the micro-phone. The ends of the circuit wires are clampedunder the screw heads passing down through…
Electric apparatus and appliances · Electric toys
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