American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 439
tive poleof b, to post II, to switch d, to back contact i of k, to trunnion q^ to post 9, toand through coils of m, to lever e, to r, and back by way of posts 8 and 12 tonegative pole of battery. With K closed the metallic circuit is from the positivepole of b to posts II, 10, to switch c, to and… … FIG. 279<^. therefore, the key is open or closed in buzzer sending the magnet m is charged bybattery b. When the key is in transit from open to closed, and vice versa, coils Mdischarge into the line by way of switch b, post 5, receiver r, and posts 4 and 2;and to earth e by way of post i. The…
Telegraph
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