A form of suspension used when a trolley makes small turns or curves. e is where the span wire is secured. e is then attached by the insulation piece (i) to the arm (p) that carries trolley wire clamp (b) that pivots at d.
International Correspondence Schools A Textbook on Electric Lighting and Railways (Scranton, PA: International Textbook Company, 1901)
Courtesy the private collection of Roy Winkelman