Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U. S. seacoast defenses .. (1904)
United States. War Dept · Washington, Govt. print. off. · leaf 206
lead is laid on. 8. Overhead lines.—(1) Erected in fortsonly where fully protected from fire or for203. Manhole. temporary uses. (2) Never attached.to trees, buildings or outside concrete walls. (3) Wires.—Hard drawn copper. No. 14 and larger, of 60,000 pounds tensilestrength, 00 per cent… … mm^imjm^.. SPECIFICATIONS FOR KE(^)UlSITIONS, ETC. 153 cent conductivity; bare galvanized iron in uninhabited country for signal i)nr-poses only. (4) In contact only Avith double petticoat porcelain or gla.ss insulators and runat least 1 foot apart and in such manner that water can not…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
