. The street railway review . 4 gum blocks are used for paving, the company beingobliged to pave 18 inches outside the tracks. The blocksare laid in 6 inches of concrete. Considerable troublewas caused by the swelling of the blocks, which nearlyclosed the slots at times. The difficulty was over-come by a longitudinal elastic joint of animal pitch,refuse from candle works, placed between each pair ofrails. The cement was required to stand a tensile strength of350 pounds per square inch, on blocks soaked in waterseven days. The average of the tests was 445 pounds,and of 140,000 casks
. The street railway review . 4 gum blocks are used for paving, the company beingobliged to pave 18 inches outside the tracks. The blocksare laid in 6 inches of concrete. Considerable troublewas caused by the swelling of the blocks, which nearlyclosed the slots at times. The difficulty was over-come by a longitudinal elastic joint of animal pitch,refuse from candle works, placed between each pair ofrails. The cement was required to stand a tensile strength of350 pounds per square inch, on blocks soaked in waterseven days. The average of the tests was 445 pounds,and of 140,000 casks of cement received, only 4,000were rejected. In order to avoid delays in case of break downs, onlylocal manufacturers were permitted to bid on enginesand boilers. There are six pairs of horizontal high pres-sure engines with 20-inch cylinders 3 feet 4 inches stroke,. GRIP CAR WITH TRAILER. with fly wheel 13 feet in diameter to each pair of engines develop 750-horse-power a pair, working60 revolutions a minute under 100 pounds pressure. Thecost was about $25,000. The order for the twentj multitubular boilers was dis-tributed among four firms. Each boiler is 15 feet 41^inches long, exclusive of smoke box, and 7 feet ^yi inches in diameter, constructed of ^-inch steel plates, 49 tubes31^ inches diameter. The steam dome is 8 feet long, 2feet 4 inches diameter. The illustrations show the interior of the power house.
Size: 2395px × 1044px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
