American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 368
—CONNFCTIONS—ON ONE BASE-BOARD. WHEATSTONE AUTOMATIC TELEGRAPH. 315 FIG. 235. … off, as in the figure, and the transmitter connections are attached to j)OSts i and 2. Posts 3 and 4 are arranged for an extra condenser, if one shoukl be necessary for a proper balance. In that case, wires from the condenser are led to posts 3 and 4, when the condenser will be found to be in…
Telegraph
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