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 207
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 cro.ss-connect. (5) Protected when necessary from accidental contacts with other lines byinsulated, dead guard, iron wires. (6) Led into… … 204, 205, 206. (8) Sag = 1 t(i 2 per cent of distance between poles, dei)endingon extremes ofheat and cold. (9) Signal wires unavoidably paralleling heavy current lines are stretchedalong lowest cross-arms. See Line Construction, page 155. (1.0) A lightning-arrester in plain view is jilaced…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
