. The street railway review . THIRD RAIL SlIPDKI. form to a trolley wire hanger. \\ ilh insulating compoundfor insulation in place of wood. Figures i and 2 showone of these thivd-rail insulators, and it is also shown insome of the other drawings. Its general principle is thatof the modern trolley wire hanger, viz.—a bolt coveredwith insulating compound and secured in a metal insulatingmaterial is fur-nished by Al-bert & J. d e r s o n ofBoston, andwas chosen onaccount of itsgreat strengthand the way ithas stood upunder insu-lation , inadapting thetrolley wirehanger p
. The street railway review . THIRD RAIL SlIPDKI. form to a trolley wire hanger. \\ ilh insulating compoundfor insulation in place of wood. Figures i and 2 showone of these thivd-rail insulators, and it is also shown insome of the other drawings. Its general principle is thatof the modern trolley wire hanger, viz.—a bolt coveredwith insulating compound and secured in a metal insulatingmaterial is fur-nished by Al-bert & J. d e r s o n ofBoston, andwas chosen onaccount of itsgreat strengthand the way ithas stood upunder insu-lation , inadapting thetrolley wirehanger princi-ple to the sup-port of a forty-eight-pound Trail on an ele-vated r o a dthere are anumber of problems to be met, and these have beenvery sucessfully worked out in the present form, whichis the invention of Messrs. Chapman and Hanson of theelectrical department. In the first place, as the^e sup-. SECTION THROUGH THIRD RAIL SUPPORT.
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
