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 162
e nails,as shown, and passed under the heads of the twoscrews in the end of the box. This is to preventthe wire from pulling the microphone out of position. MICROPHONE. 161 The complete instrument is arranged as shown. Abattery and telephone receiver are put in circuit be-tween the binding screws.… … Fig. 68. Wire Nail Microphone. using three wire 69. In this instance, instead ofnails, three pieces of carbon are used. Two of the pieces should be about 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 apparatus and appliances · Electric toys
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