The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 372
umstances. Strength of Ropes.—For the mens safety it is very importantthat the sash lines and ropes used shall be of adequate strength.Manila ropes are generally used, the sizes being based on theircircumferences ; thus a 3-inch rope means one which is 3 inchesin girth. Eopes should be kept dry as… … Fig. 336.—Dead-Manfor Pole-raising 344 PRACTICAL TELEPHONE HANDBOOK
Telephone
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