Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 317
able,Underground. Underground Canalisation, a term denoting conduits or subways for the loca-tion of cables for transmitting and distri-buting electricity in cities. See Cable,Underground; Conduit, Underground;Conduit System; Ducts. Underground Conduit. See Conduit,Underground; Conduit System of… … Wilgus-Sprague Under-contactProtected Third Rail See Cable, Several types of these conveyors have beenintroduced. In one method, steel troughsare laid along the face; in the trough runsa steel chain driven by an electric motor;the chain carries scraper-blades which carrythe coal along the trough…
Electrical engineering
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