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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 456
Fig. 13. Single Suspension.For Iron Poles. TROLLEY WIRE SUSPENSION. 443 … Fig. 15. Double Suspension. For Wood Poles.Electrical engineering
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
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