The practical telephone handbook and guide to the telephonic exchange (1906)
Poole, Joseph · New York, Macmillan Co. · leaf 417
Fig. 386.—Manhole under Footpath * In the latest practice the bottom end only of the pipe is stoppedup with three inches of concrete. 388 PRACTICAL TELEPHONE HANDBOOK thick for the small, and 14 inches thick for the large man-holes under roadways, as shown in Figs. 387 and 388. The roof is… … Fig. 387.—Manhole under Roadway (Scale -jV) York stone blocks resting on the joists and brickwork and themanhole cover frame is fitted on top of these as shown, thewhole being rendered watertight by cement. If formed undera roadway heavier joists, 5 inches by 4| inches, should be used,as shown in…
Telephone
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