Hawkins electrical guide. Questions, answers & illustrations; a progressive course of study for engineers, electricians, students and those desiring to acquire a working knowledge of electricity and its applications; a practical treatise (1914)
Hawkins, N. (Nehemiah), 1833- · New York, T. Audel · leaf 141
rs. This factaccounts for the somewhat greater cost of the single over the multipleconduit which is usually laid by ordinary laborers. One good brick-layer and helper, however, will lay from 200 to 300 feet of single ductconduit per hour. Practically the same standard of construction is maintained… … Fig. 976.—Vitrified clay or earthenware trough conduit; this type of conduit consists oftroughs either simple or with partitions, the latter type being shown in the figure. Vitrified Clay or Earthenware Trough Conduit.—It con-sists of troughs either simple or with partitions as shown in fig.976.…
Electrical engineering
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