American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 68
cases where this has been done, the sounders have been wound to about 40ohms, and the dynamo machine has been designed to have a very low internal resis-tance, which is rendered necessary by the fact that all the sounders are connected inmultiple and, hence, a very low, joint resistance of the… … DYNAMO ARRANGEMENTS FOR LOCALS. Assuming that there may be 800 sounders in a large office. This at 4 ohms eachwould give a range in the resistance of the external circuit c of, from 4 ohms, when allbut one of the sounders are open, to five thousandths of an ohm when all the soundersare closed. With…
Telegraph
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