Modern electricity and magnetism, theoretically and practically considered (1885)
Avery, Elroy M[cKendree], 1844- [from old catalog] · New York and Chicago, Sheldon and company · leaf 71
Fig. 159. Fig. 160. The clappers are suspended by silk threads. Work the machineslowly ; the bells will begin to ring. Explain, FmCTIOKAL ELECTRICITY. 241
Electricity · Magnetism
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