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 169
h holes are bored to insert a keyholesaw through the joint between two boards at each end of the WIRING OF BUILDINGS 857 pocket, and as near the beams as possible, then the board iscut at an angle as indicated in fig. 1,001. Having sawed acrossthe board at both ends, it is pried out with a chisel… … Fig. 1,004.—Device for examining partition interiors. A pocket flash lamp and a little mirrorare the only apparatus required to inspect the interior of a wall or partition which wouldordinarily be inaccessible. For fishing wires, retrieving cable and inspecting finished work,the lamp and mirror…
Electrical engineering
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