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 455
e wooden poles are vised a good form of construction is to bore the poleat the proper height and run through it the tube for the arms, this longtube being properly stayed on both sides of the pole by irons from the pole-top to the bracket ends, or by braces against the pole. The trolley support-ing… … Fig. 11. Single Suspension.For Wood Poles. Figures 15 and 16 illustrate simple forms of center-pole brackets.
Electrical engineering
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