American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 77
keys and relays in one Morse circuit, and with but two main batteries, one at each end. In Fig 35, are shown four such stations, a, b, c, d; ad being terminal, and bc intermediate, or way. stations. The keys at b, c and d are closed, the key at aopen, consequently, as this opens the entire circuit,… … t=L^
Telegraph
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