The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 396
gth of wire called a tail,looped round the arm on the pole. By the key lever shownthe drum can be turned, thus drawing the vice nearer to thearm, and carrying the wire with it. The sag of one of the wiresto be erected is regulated to the proper tension, as given in thetables supplied, by the… … Fig. 365.—Draw Vice and Ratchet with Key Lever up until they are parallel with the first, and the tension thusequalised. Another convenient tool, called a come along, is used inAmerica for gripping the line wire. It is based on the camprinciple, and has the advantage over the ordinary vice of…
Telephone
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