. The Street railway journal . tthe lowest point ofthe pole to preventthe bottom kickingout. To distributethis inward pressureover a large area thebolts that are used tosecure the poles tothe wall extendthrough the wall fortwo feet and termi-nate in large plates buried in a mass of concrete. On outside lines woodenside poles are used. These poles are of tapered, square,sawed and planed redwood 8 ins. X Sins, at the top, 12 ins. at the butt, 30 ft. long and set in 2j4 in. X2)4 in. X 6 fi. holes. These wooden poles are not setin concrete nor yet in the excavated material, but inclean bro
. The Street railway journal . tthe lowest point ofthe pole to preventthe bottom kickingout. To distributethis inward pressureover a large area thebolts that are used tosecure the poles tothe wall extendthrough the wall fortwo feet and termi-nate in large plates buried in a mass of concrete. On outside lines woodenside poles are used. These poles are of tapered, square,sawed and planed redwood 8 ins. X Sins, at the top, 12 ins. at the butt, 30 ft. long and set in 2j4 in. X2)4 in. X 6 fi. holes. These wooden poles are not setin concrete nor yet in the excavated material, but inclean broken rock. The tarring of the bottoms of thepoles for six feet, and the .setting of broken rock used so as to accommodate both sets of wires with a singleline of poles. This is shown clearly in Fig. 3. The height of the trolley is fixed at twenty-one feet, onordinary work and twenty-two feet over steam railwaycrossings. The sag that will produce the strain for whichthe poles are raked is told the wirenien, fixing thus the point. FIG. 3. -VIEW ON RAILROADELECT
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
