The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 364
antage, as it acts as a flexible spring to the wires, givingway a little under excessive stress, due to extreme cold, snow,etc., and thus relieving the wires from excessive strain. The last figure shows the J bolt attached to an iron arm,and Fig. 327 shows it adapted to a wooden arm. Both… … Fi^ ft27.—Terminating on J BoltWooden Arm
Telephone
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