Hobart, H. M. (Henry Metcalf), 1868-1946 ed · Philadelphia, J. B. Lippincott · leaf 307
nt. Trolley WheelWITH RenewableCentre.—The sidesof a trolley wheelhave a very long life,say 80,000 km ormore. But the wearon the centres isfar greater, and thecentres have a life ofonly some 8000 km.These circumstances have led to the development of trolleywheels with renewable centres. In… … Self-oiling Trolley Wheelwitli Renewable Centre centre, but in this instance, the bvsh is ofgun metal and is self-oiling. Trolley Wire, a conducting wire of hard-drawn copper or bronze, from 0*3 to 05 inin diameter, which is suspended from in-sulators over or alongside an electric tramwayor…
Electrical engineering
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