. The Street railway journal . apable of sustainingon a clear span of 12 ins. of cen-tral load not less than 2500 lbs.,and shall deflect in. beforerupture. They are held to the tieby three -lag screws 4I/I and -)4 in. in diam-eter. A templet, found ofgreat convenience in boringholes in the for the third-rail brackets, is illustratedon page 1006. It consistsof a ^-in. wrought-iron platereinforced with i-in. pine,and is provided with abracket 4 ins. wide whichfits over the top of the runningrail. I004 STREET RAILWAY JOURNAL. [Vol. XXIX. No. 23. INSULATORS The insulators are r
. The Street railway journal . apable of sustainingon a clear span of 12 ins. of cen-tral load not less than 2500 lbs.,and shall deflect in. beforerupture. They are held to the tieby three -lag screws 4I/I and -)4 in. in diam-eter. A templet, found ofgreat convenience in boringholes in the for the third-rail brackets, is illustratedon page 1006. It consistsof a ^-in. wrought-iron platereinforced with i-in. pine,and is provided with abracket 4 ins. wide whichfits over the top of the runningrail. I004 STREET RAILWAY JOURNAL. [Vol. XXIX. No. 23. INSULATORS The insulators are required to pass the following tests: The insulators used for holding the third rail in the brack- (a) Resistance. After immersion in water for seventy- ets were supplied by the Ohio Brass Company and are of two hours and the surface wiped dry, the insulation re-sistance of all insulators, measured fromhook bolt slot to rail slot, shall be not lessthan 10 megohms. When subject to a pre-cipitation of three-quarters of an inch of. -> A,J 1 / N T A -lit— II 1^ i V^ > B<- „ Plan ■ \l 1 ^iew of Insulator, i J (•— Section A-B. KcHl^1-<- NoTR:-Masiinum allowable variation Erom dimensionsA }^2 ■I from other dimeiisinns J^o INSULATING BLOCK i-OR INCLINE Section C-D. Street
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
