. The street railway review . 12 in. in diameter and 6-in. stroke, and are held inposition when at rest by four cast steel blocks which are pushedin and drawn out by hydraulic rams 4 in. in diameter and 36-in. Nov. IS, 1901.] STREET RAILWAY REVIEW. 845 stroke. The hydraulic system is operated by a Watson-Stillmanfour-plunger horizontal pump located on the platform carried onthe radial struts of the turntable beneath the floor of the liquid used in the hydraulic system is a product of petroleummade in Germany, known as petrolatum. It is a very low tem-perature oil clear and colorless
. The street railway review . 12 in. in diameter and 6-in. stroke, and are held inposition when at rest by four cast steel blocks which are pushedin and drawn out by hydraulic rams 4 in. in diameter and 36-in. Nov. IS, 1901.] STREET RAILWAY REVIEW. 845 stroke. The hydraulic system is operated by a Watson-Stillmanfour-plunger horizontal pump located on the platform carried onthe radial struts of the turntable beneath the floor of the liquid used in the hydraulic system is a product of petroleummade in Germany, known as petrolatum. It is a very low tem-perature oil clear and colorless and does not show any appreciablethickening at a temperature of 5° below zero. The oil is forced bythe pump into the accumulator, which consists of two pressed steeltanks, one containing air; the other the solution under pressure. Incommencing an operation of the bridge the pressure is about 2,500lb. per sq. in. The lifting of the ends and drawing of the wedgesreduces this pressure to about 1,500 lb. per sq. in. The pump is. SUPPORTS AT DKAW. driven by a General Electric motor of the encased street railwaytype, attached to the main shaft of the pump. On the fixed spans approaching both ends of the bridge are steeltruss gates which are operated by electric motors placed under-neath the floor of the bridge, the operation is controlled entirelyfrom the operating rooirr of the drawbridge. The gates swing intwo parts and when not in use are in line with the curbing anddirectly over it. The current is carried to the gate motors by asubmerged armor cable. The entire operation of the bridge, including movements of gatesand draw, is conducted from a small building, or cab, carried ongirders between the posts of the center tower and over the road-way. The one room is 12 ft. square with windows on all four
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Keywords: ., book, bookcentury1800, bookdecade1890, booksubjectstreetrailroads
