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 86
ficientlyimpervious to moisture to render it suitable for use in dampplaces, and it is liable to be crushed or punctured. Furthermore,it is naturally very combustible. These difficulties are overcome 774 HAWKINS ELECTRICITY to a certain extent by impregnating the moulding with somekind of moisture… … TONGUEBACKING Pig. S69.—Standard wooden moulding for encasing wires. Wooden moulding must not beused in concealed or damp places, nor be placed directly against a brick wall where sweat-ing may introduce moisture that may ultimately cause a short circuit. Wooden mouldingfor concealing electrical…
Electrical engineering
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