. A manual of the principles and practice of road-making : comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and railroads . inch high,the head of the inner screwbeing countersunk. The later ones weigh 70 lbs. to theyard, and are 2^ inches high ; the increase of height be-. 308 RAIL-ROADS. ing intended to compensate for not countersinking the nutof the inner screw. The longitudinal timbers are 15 by9 inches, and the cross-ties bolted to them at intervals of9 or 10 feet, are 5 by 8 inches. With such rails, and thebroad gauge, this railroad comb
. A manual of the principles and practice of road-making : comprising the location, consruction, and improvement of roads (common, macadam, paved, plank, etc.) and railroads . inch high,the head of the inner screwbeing countersunk. The later ones weigh 70 lbs. to theyard, and are 2^ inches high ; the increase of height be-. 308 RAIL-ROADS. ing intended to compensate for not countersinking the nutof the inner screw. The longitudinal timbers are 15 by9 inches, and the cross-ties bolted to them at intervals of9 or 10 feet, are 5 by 8 inches. With such rails, and thebroad gauge, this railroad combines speed and ease ofmotion in the highest degree yet attained. INCLINATION OF THE RAILS. The wheels having a conical shape, they would toucha level rail only on a narrow line, and both would soon beworn into grooves. To prevent this, the rails are some-times inclined inward, so as to meet the cone of the wheelmore directly, and to present a broader bearing usual inclination is from 1 in 29 to 1 in 20. It maybe given by sloping the blocks, or by cutting the sleeperswhich support the rails, or may be formed in the originalrolling of the rail. An objection to this breadth of con-tact is that a rubbing and grinding action is constantlycaused by the unequal velocities with which the outer andinner parts of
Size: 2216px × 1127px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1850, booksubjectrailroa, bookyear1853
