American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 164
ohm coils in r, r, are shown as in use, making the ratio of thosearms equal, b is an adjustable rheostat, having resistance coils amounting in the ag-gregate to 11,110 ohms. K, k, are keys which, normally, keep the battery and gal-vanometer circuits open, but w^hen depressed close those circuits. G… … 129 130 AMERICAN TELEGRAPHY. Siemens wheatstone beidge.—Another form of the Wheatstone bridge, knownas Siemens pattern, is outlined in Fig. 109. This form of bridge differs from the Post Office pattern chiefly in the arrange-ment of the coils of the adjustable rheostat; the general connections are…
Telegraph
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