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 164
ith the micro-phones just described. The materials necessary are a round bar magnet TELEPHONE RECEIVER. 163 % by 3 inches, one drachm No. 36 silk-covered mag-net wire, a piece of ferrotype plate 3x3 inches, twosmall brass terminals, a piece of round hard woodabont 1 x 4% inches, and a round wood… … Fig. 70. Telephone Receiver. torn of the wooden box and, after squaring off the endof the round hard wood piece, glue the bottom of thebox on the end of the piece, keeping the two 14-inchholes in line. On the opposite end of the hardwood piece is fitteda circular disk of brass about 14 inch larger…
Electric apparatus and appliances · Electric toys
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