American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 621
lated, tt and relays kk each have two armatures, as indicated. Thearmatures of r r are really pole-changers for batteries B b. When no trains are ona block, relays tt are closed by track batteries I) I), and at such times circuit of bat-tery B, for instance, is completed via lower armature of R to… … X Y MILLER CAB SIGNAL. block to a short block, a circuit is provided from battery B or b through the cabcircuit. The direction of current at this time (assuming no engine on block ahead)is such that the armature A of a polarized lelay p is atti-acted to contact 6, completinga circuit through a…
Telegraph
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