The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 381
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 two bands (only partlyshown) each of two No. 11 galvanised-iron wires, passed rightround the chimney ; iron angle plates being fitted at the…
Telephone
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