American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 598
local circuit is controlled by the armature lever of rm. The armatureof RM is so adju^^t^d that the usual current on the main circuit will not attract it.At such times it retains in a vertical position, by means of its hook end e, the up-right rod L. When, however, by any means, the current on the…
Telegraph
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