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 152
Fig. 231. … local circuit, it and the 322 MAGNETISM, sounder lever vibrating in obedience to the motions of the key atthe sending station. Of course, the sending operator can read hisown message from his sounder. The message may also be read fromany sounder on the line. {d.) If the local circuit at New York…
Electricity · Magnetism
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