American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 136
The coils of wire used for such purposesare generally placed together in one box, termeda rheostat. It is desirable that these coilsshould not occupy much space, and for thatreason an alloy possessing high electric resistance is usually employed in thiscapacity, most generally German silver, the… … * The factor by which B has to be multiplied to get the amplitude at a given distance is termed the attenuation factor. I02 AMERICAN TELEGRAPHY. To prevent such magnetic effect the coils in rheostats are doubled backon themselves in the manner indicated, in Fig. 83. The result is that, as the…
Telegraph
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