. The street railway review . hori-zontal plane. The piecethat holds the trolley poleis pivoted in C-shaped bab-bitted bearings and is heldin its bearings by the ten-sion of the springs alone,being free to move for alimited distance in the op-posite direction from thesprings, this freedom tok i c k greatly easing the blow caused when the trolley wheel jumps the wire and thepole flies upward suddenly. This blow is further cushioned bya piece of rubber I x I/i x 4 in., which is inserted at the topof the casing where the pole-base casting would otherwise backward kick is limited by two
. The street railway review . hori-zontal plane. The piecethat holds the trolley poleis pivoted in C-shaped bab-bitted bearings and is heldin its bearings by the ten-sion of the springs alone,being free to move for alimited distance in the op-posite direction from thesprings, this freedom tok i c k greatly easing the blow caused when the trolley wheel jumps the wire and thepole flies upward suddenly. This blow is further cushioned bya piece of rubber I x I/i x 4 in., which is inserted at the topof the casing where the pole-base casting would otherwise backward kick is limited by two projections on the under sideof the base casting which strike a stop bar and prevent a dislo-catioti of the base piece from its bearings. This arrangementmakes a differential joint keeping the upward pull exerted at theouter end of the pole nearly constant whatever the position of thepole, for as the end is pushed or pulled down the tension of thesprings increases in practically the same proportion as the i;ip.\.
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
