American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 619
^i_ . … 1>^ ± l_ and 3Thusbe- hart train signal. bell. When, however, any of the buttons are depressed tlie shunt circuit iis opened, thereby permitting all the current to flow through the large bell c.this arrangement affords oj^portunity for the removal, at leism-e, of the crosstween wires 2 and 3.…
Telegraph
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