American telegraphy and encyclopedia of the telegraph; systems, apparatus, operation (1909)
Maver, William, jr. [from old catalog] · New York, Maver publishing company · leaf 659
anti-hum device.—In many places it is necessary, in order to retain possessionof right of way, to obviate the humming noise due to the vibration of tlie wires. Thiscan be accomplished by the use of a device known as the • anti-hum, which is shownin Fig. 423. FIG. 423. … A is a galvanized iron shackle, inserted directly in the line wire, near the pole, andprovided with a washer, or cushion, of rubber, or other suitable material, to take up thevibrations. As this would break the circuit as well as the vibrations, a piece of wire, w, termeda bridle or jumper, is…
Telegraph
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