. The Street railway journal . actically aneven surface, with no appreciable obstruction to the move-ment of the trolley wheel. This device is used in conjunctionwith round top insulators of extremely heavy surface of the insulation inside of the round top bell,between the edges of the latter and the supporting stud,instead of being smooth, is provided with an ample petti-coat molded in the insulation and about 1 in. in heightfrom the base of the petticoat on the main surface of theinsulating material to the tip. This provides almost 2ins. of additional surface between the met
. The Street railway journal . actically aneven surface, with no appreciable obstruction to the move-ment of the trolley wheel. This device is used in conjunctionwith round top insulators of extremely heavy surface of the insulation inside of the round top bell,between the edges of the latter and the supporting stud,instead of being smooth, is provided with an ample petti-coat molded in the insulation and about 1 in. in heightfrom the base of the petticoat on the main surface of theinsulating material to the tip. This provides almost 2ins. of additional surface between the metal of the bellhanger and the central stud, and retains all the other ad-vantages of a petticoat in such devices. This hangerweighs almost twice as much as one of ordinary construc-tion. The stud projecting from the insulator into the cliphub is in. in diameter. In feeding into the line a 00 copper insulated cable issubstituted in place of the ordinary f-in. twisted steelspan wire, insulating the ends with the same giant strain. 564 STREET RAILWAY JOURNAL. [Vol. XX. No. 14. insulators just outside the eye bolts, and making a non-insulated soldered connection with the trolley wires. Ashort feed tap, of the same wire, is made between this wireand the feeder, just beyond the first insulator, near thepole. This construction protects the tap from being tornoff by the trolley pole should the wheel jump at this point,as sometimes happens in high-speed roads. There are noswitches at the turnouts, the wire on the turnout side beingdeflected and following the turnout. To every tenth spanthere is a feed span and tap, and at every twentieth spanthere is a lightning arrester. At about every half milestrains are run off from the trolley wires in both directions,extending to the pole at the next span, above its spanwire, and from this to the next pole to which it is attachedat about 8 ft. from the ground. The spans on straight lines are 100 ft. apart, this distancebeing reduced on curves accor
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
