Electrical engineer's pocket-book: a hand-book of useful data for electricians and electrical engineers (1901)
Foster, Horatio A. (Horatio Alvah), 1858-1913 · New York, D. Van Nostrand co.; London, E.& F.N. Spon, ltd. · leaf 454
tion must be provided for both ends of the span wire. Span wire must be pulled very taut when erected so that the sag underload will be a minimum. Height above rail surface should be at least 18feet after the trolley-wires are in place. This height is regulated by statutein some States, and runs… … STRETCHED FIG. 10. Views of Trolley Spans with Plus and Minus Feeder connectionsand Plan of Double Track Y, showing Location of Insulators. SI»E BRACKETS. Along country roads and in such places as the track is along the side ofthe roadway or street, it is customary to use single poles with side…
Electrical engineering
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