. The street railway review . an equilateral triangle. All joints onthese circuits are made with Mclntyre connectors and the jointhas been found very satisfactory. High tension wires are tied tonumber two Provo glass insulators, weighing six pounds each,with a diameter across the base of 7^ in. The bottom of the insulator is fully 5 in. above the cross was preferred to porcelain and has worked effectively. Theline received its first current of high voltage in a downpour of rainand no trouble was given by a single insulator, in fact no part ofthe equipment gave any trouble whatsoever.
. The street railway review . an equilateral triangle. All joints onthese circuits are made with Mclntyre connectors and the jointhas been found very satisfactory. High tension wires are tied tonumber two Provo glass insulators, weighing six pounds each,with a diameter across the base of 7^ in. The bottom of the insulator is fully 5 in. above the cross was preferred to porcelain and has worked effectively. Theline received its first current of high voltage in a downpour of rainand no trouble was given by a single insulator, in fact no part ofthe equipment gave any trouble whatsoever. The glass insulatorsare believed to be much superior to porcelain, and the lower costis not the least thing to be considered. They do not require a testbefore being placed in service and the life without deteriorationis longer. Insulators are placed on special oak pins, 14 in. long which havebeen boiled in paraffine oil. These pins are socketed in cross arms,6 ft. and 8 ft. long and are held firmly in place by plugs, made of. DIAGRAM OF POLE. round maple dowclling stuff, which is driven through bidesin the cross arm and pin. Ibis method is used in preference tonails. The usual braces, bolted ito cross arms and lagged to pole,hold the cross arms in position. The illustration showing the polewith cross arm and bracket construction nives other measurements in detail. The poles are 40-ft. and 30-ft. lengths with 7 in. lopsand 13 in. in diameter, 6 ft. from the base and were shipped from a northern Michigan timber point. Considerable difficulty was experienced, in securing poles thatwould pass inspection and the writers experience the last year with ! part of overhead eon,1 inn ion. indicates that Michigan will oon be barren of suitable timber for 30 ft., 35-ft, or 40-fl poles Vln idj the telephone panies are ing thi Washington and Idaho cedar, and tie increased freight charges make the poles from the lattei tat COS) re than thoSl that Michigan can furnish. though l
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
