. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ut it is that the road is supported on single columns, and is believed to bethe only instance in existence where two tracks are thus carried, although in certain parts ofthe elevated railway structure in New York a single track is thus supported. The length ofthis viaduct is 1,535 ft., of which 50 ft. at each end are occupied by concrete approaches, andthe remaining 1,435 ft. represent the length of the metal work.
. Modern mechanism, exhibiting the latest progress in machines, motors, and the transmission of power, being a supplementary volume to Appletons' cyclopaedia of applied mechanics . ut it is that the road is supported on single columns, and is believed to bethe only instance in existence where two tracks are thus carried, although in certain parts ofthe elevated railway structure in New York a single track is thus supported. The length ofthis viaduct is 1,535 ft., of which 50 ft. at each end are occupied by concrete approaches, andthe remaining 1,435 ft. represent the length of the metal work. The viaduct affords nothoroughfare except for the cable cars, and in fact no other vehicles could travel over it,as the roadway is all open work. The height from tlie ground to the rail level is 25 ft. 9 in.,and the width between hand rails is 25 ft. The ruling span is 50 ft,, but there are two spansof 55 ft., three of 40 one of 30 ft., and one of 20 ft. The main trusses are of the Warrentype, 4 ft. deep, and weighing 100 lbs. per running ft. There are two curves on the viaduct,each of 60 ft. radius to the center line, and at these points there are braced posts to take. Fio. 4.—Cable railroad. RAILROAD, CABLE. 711 the strain, and the tracks are also carried on double posts at these points, as well as at the approaches, as a precautionary measure. The entire length of the straight surface tracks of the cable line is 99,^28 ft.; of theviaducts, 4,250 ft.; of bridges, 2,124 ft.; of curves, 2,010 ft.;and of the pits, 563 ft.; making a total of 108,274 ft. oftrack, or rather over 20^^ miles, and tho construction required1,444 tons of track and slot rails, and 2,919 tons of ironsleepers. As already stated, there are three power stations on the sys-tem, all similar in arrangement. Ihe engines are com-pound, the high-pressure cylinder being 26 in. in diameter,and the low-pressure 43 in. in diameter; the stroke is 48 are intended to develop 7(J0 horse-power at a speed of7
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Keywords: ., bookcentury1800, bookdecade189, booksubjectmechanicalengineering
