. Handbook of construction plant, its cost and efficiency. he platform or car runs on four solid doubleflange cast steel wheels, 16 ins. in diameter and 4 ins. track consists of two 90-lb. rails each spiked to 6 x 8 in. x 4ft. ties spaced 2 ft. apart and bolted to two 2 x 12 in. x 30 The engine may be any good make 10 x 12 in. enginewith double drums and two niggerheads. The hauling line is% in. and return cable is % in.; 18 in. sheaves are used. The tower is moved forward or back by a 1% in. manila linesecured to a deadman suitably placed, passing through sheavessecured t
. Handbook of construction plant, its cost and efficiency. he platform or car runs on four solid doubleflange cast steel wheels, 16 ins. in diameter and 4 ins. track consists of two 90-lb. rails each spiked to 6 x 8 in. x 4ft. ties spaced 2 ft. apart and bolted to two 2 x 12 in. x 30 The engine may be any good make 10 x 12 in. enginewith double drums and two niggerheads. The hauling line is% in. and return cable is % in.; 18 in. sheaves are used. The tower is moved forward or back by a 1% in. manila linesecured to a deadman suitably placed, passing through sheavessecured to the platform and around the niggerhead. The trackis also moved ahead by the same means, the deadman beingdispensed with and line passing around the end of a boom whichis a part of the tower. The line around the niggerhead is op-erated by the fireman. The operators cabin is placed up about one-third the heightof the tower in full view of the work, and the engine is manipu-lated by suitable levers and brakes connecting the operatingcabin with the f/ycmtf. Fig. 121. Details of Tower for Field Tower Excavator. EXCAVATORS 311 Scraper Bucket. The distinctive feature of the excavationis the scraper bucket which is shown by Fig-. 122. This bucket hasa capacity of 48 cu. ft. level full, but in ordinary material it willcrown up to 2 cu. yds. capacity. Particularly easy and certaincontrol are claimed for this bucket. These advantages arebrought about by the combination of two sheaves placed at therear end of the scraper at right angles and vertically to it, thereturn line passing reversely over the upper and under the lowersheave, while the bottom of the scraper is fitted with two curvedcradles or shoes, resulting, in connection with the pulling line,in such control of the cutting edge that the scraper can be sus-tained at any vertical angle at the will of the operator. Cost Data. The chief first cost of this plant is in the hoist-ing engine and cable, which are all standard co
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectbuilding, bookyear191
