American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 137
in the opposite direction, in theparallel portion of the coil. The coils of the rheostat are usually mounted on bobbins, and are connected upin the rheostat, practically as shown in Fig. 83 a. The brass plates numbered 3000, 2000, 1000, etc., are set in the ebonite cover ofa box of suitable size to… … The brass plates have semi-circular openings cut in them into which metal plugsp, Fig. 83, and a, b, c. Fig. 83 a, can be inserted to connect any two brass plates for thepurpose of short circuiting any coil whose terminals come to the i)articular jDlatesinto which a plug may be inserted. Thus, when…
Telegraph
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