The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 380
ld be taken that it is thoroughly well done. Double poles are made up of two, and triple and multiplestandards of three or more upright poles connected by speciallong arms, providing for 8, 12, and 16 wires. From the largersizes of these, Exchange Standards can be constructed of 3, 4,or more sides.… … Fig. 346.—General View of Exchange Standardgirders built into the walls, so as to give a firm and rigid fixing. 352 PRACTICAL TELEPHONE HANDBOOK Chimney Brackets.—Wires should only be attached to strongchimneys, and the form of double bracket shown in Fig. 347should be used, this being attached by…
Telephone
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