Handbook of mechanical and electrical cost data, giving shipping weights, capacities, outputs, and net prices of machines and apparatus, and detailed costs of installation, maintenance, depreciation and operation, together with many principles and data relating to engineering economics (1918)
Gillette, Halbert Powers, 1869-, Dana, Richard Turner, 1876-1928, joint author · New York, McGraw-Hill · leaf 1000
path ofthe conduit line and when fiber duct is used. In constructing conduit lines with fiber duct the constructionis similar to that shown in the cross-section of Fig. 5. The ductsare separated by an inch of concrete and surrounded on the out-side by an envelope 3 ins. thick. The trench is dug… … Fig. 5. Section of concrete conduit line using fiber duct. poured and tamped into place and the second tier laid, and soforth, until the line is constructed. Between the tiers the jointsare staggered, which tends to increase the strength of the finishedline. The trench is dug according to the width…
