American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 370
0 0- ;6r \ 1 2 3 ^\^ armature which is necessarily very small, is regulated by the distance between thecontact points c, c. These contact screws move in the brass supports s, s. Thisrelay is adjusted for a balance in, practically, the same way as the ordinary polarduplex relay. The bobbins and…
Telegraph
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