Specifications for the multiplex printing telegraph system : theory and operation (1920)
Western Union Telegraph Company · [New York?] : The Company · leaf 124
-WW* LOCAL SEGMENTS PRINTERRELAY RECEIVING SEGMENTS lp B H g g D D D D DDDDPaDDDDD … the selecting relay common return circuit, the right hand release magnet contacts topositive battery. A current therefore flows through the relay £lnd causes it to close itscontacts. The closing of the left hand contact locks the relay in its operated positionby applying to the left hand end of the…
Telegraph
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