. The Street railway journal . granite crushers at a neighboring quarry, and asthe granite dust showed a superior tensile strength of from20 to 50 per cent, over the sand, it was adopted and used inat least 80 per cent of the work. The concrete in the footings was made of a mixture ofone part cement, three of sand and six of stone, except thatin wet pits near Bacon Quarter Branch, more cement wasadded. In all of the rest of the work a 1:2:4 mixture wasused. This was made quite wet and the concrete was thor-oughly worked into the reinforcement with spades andrammers. No concrete was allowed to
. The Street railway journal . granite crushers at a neighboring quarry, and asthe granite dust showed a superior tensile strength of from20 to 50 per cent, over the sand, it was adopted and used inat least 80 per cent of the work. The concrete in the footings was made of a mixture ofone part cement, three of sand and six of stone, except thatin wet pits near Bacon Quarter Branch, more cement wasadded. In all of the rest of the work a 1:2:4 mixture wasused. This was made quite wet and the concrete was thor-oughly worked into the reinforcement with spades andrammers. No concrete was allowed to go in that had stoodas long as fifteen minutes. After the forms were removed, porous places in thecement were plastered up with i: 2 mortar and a finish ofsand and cement applied with a brush was required. The track rests upon 6-in. x 12-in. heart pine stringers,placed over the girders on each side. The cross-ties are8 ins. X 8 ins. x 9 ft., spaced 12 in. on centers, and are oak. Q ^ \ CORRESPONDENCE NOTES ON SPEED-TIME CURVES. CROSSING OF THE SEABOARD AIR LINE RAILWAY AND! i- SHOWING FALSE WORK Every 5 ft. a %-in. bolt, imbedded 9 in. in concrete, goesup through the stringer and tie, while half-way between isa bolt through the stringer only. The holes in the stringerswere 2 in. in diameter and afterwards were filled up with1: 3 mortar. This was to facilitate the placing of the string-ers and also to prevent any tendency of the bolts to rust offwhere they come out of the girder. On the outside ofcurves a 12-in. x 12-in. stringer was used, thus giving theproper elevation of the rail, which was full at the beginningand end of curves and dropped off }i in. to each foot. The guard rail is of 8-in. x lo-in. pine, dropped 2 the ties. A walk-way is provided on the west sideof the viaduct by using a 12^-ft. tie every 5 ft. and a neathand rail of angle posts and pipe is added for safety. Thesupports for the trolley wire will rest on 8-in. x 14-in. xi6-ft. oak ties, placed ev
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
