Handbook for the use of electricians in the operation and care of electrical machinery and apparatus of the U.S. seacoast defenses (1902)
United States. War Dept, Anderson, George Lucius, 1849-1934 · Washington, Govt. Print. Off. · leaf 203
202. Clay Conduit in CementMandrel. … 203. Manhole. SPECIFICATIONS FOR REQUISITIONS, ETC. 153 cent conductivity; bare galvanized iron in uninhabited country for signal pur-poses only. (4) In contact only with double petticoat porcelain or glass insulators and runat least 1 foot apart and in such manner that water can not cross-connect.…
Electric machinery · Searchlights · Coast defenses
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
