Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 303
rand of the overhead wire vary greatly atdifferent points of the route. [a. h. a.] Trolley, Double, a system in which twoinsulated overhead trolley wires are used, in-stead of one wire with earth return. Rarelyadopted, on account of the difficulty in main-taining the insulation between the… … Trolley Base frame, free to rotate in a horizontal plane;the frame in turn carries the trolley A (seefig.), which is pivoted to move in a verticalplane, and is pressed upwards against theoverhead conductor by springs B attached tothe frame. Trolley Bushing, a tube of metal orgraphite forming the…
Electrical engineering
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
