Modern electrical construction; a reliable, practical guide for the beginner in electrical construction, showing the latest approved methods of installing work of all kinds according to the safety rules of the National board of fire underwriters (1905)
Horstmann, Henry C[harles], 1858- [from old catalog], Tousley, Victor Hugo, 1875- [from old catalog] joint author · Chicago, F. J. Drake & Co. · leaf 208
orif a key is required, a special socket designed for the currentto be used must be made. Any special sockets must follow thegeneral spirit of these specifications. h. Marking.—The standard socket must be plainly marked250v., 50 c. p., and with the manufacturers name or regis-tered trade mark.… … Figure 130 dented or knocked out of shape. Brass shells must be at leastthirteen one-thousandths of an inch in thickness, and shellsof any other material must be thick enough to give the samestiffness and strength as the required thickness of brass. d. Lining.—The inside of the shells must be lined…
Electrical engineering
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