. The Street railway journal . en the tracks on 12-in. stringers,which in turn rest on 12-in. crossbeams. This construction leaves thespace between the rails of each of thesix tracks crossing the pit open andfree for the workmen. The hoist, as shown in the draw-ings, is formed of two 9-in. I-beams,45 ft. long, for each track. Each beam carries one side ofthe car, and is supported on three 7-1n. steel jack screwsthat are raised and lowered through cast-steel bevel gears andpinions. The pinions on opposite jacks are mounted on extending across the pit, three for each hoist. Thesesho
. The Street railway journal . en the tracks on 12-in. stringers,which in turn rest on 12-in. crossbeams. This construction leaves thespace between the rails of each of thesix tracks crossing the pit open andfree for the workmen. The hoist, as shown in the draw-ings, is formed of two 9-in. I-beams,45 ft. long, for each track. Each beam carries one side ofthe car, and is supported on three 7-1n. steel jack screwsthat are raised and lowered through cast-steel bevel gears andpinions. The pinions on opposite jacks are mounted on extending across the pit, three for each hoist. Theseshort shafts are in turn driven through straight gearing froma motor-driven line shaft running the length of the pit. Eachjack screw operates in a case consisting of an 8-in. wrought-iron gas pipe, 3 ft. 4 ins. long, set 2 ft. 6 ins. in the concrete ■footing. The case is filled with lubricating oil. Automaticlimit switches are provided to stop the hoist at its maximumheight above the floor. The hoist I-beams extend the width of.
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
