. The Street railway journal . lar to those used in railway signal work. These switchesare erected in a masonry structure, with each pole and the oiltank, in which it is immersed, in a separate fireproof compart-ment. There are two stationary contacts per pole, one con-nected to the incoming lead and the other to the outgoing leadof the same phase, while the movable contact for each pole con-sists of a U-shaped copper piece fastened to the end of a stoutwooden rod. The wooden rods are fastened at their upperends to a common cross bar, which, through a system of levers being adjacent to the mai
. The Street railway journal . lar to those used in railway signal work. These switchesare erected in a masonry structure, with each pole and the oiltank, in which it is immersed, in a separate fireproof compart-ment. There are two stationary contacts per pole, one con-nected to the incoming lead and the other to the outgoing leadof the same phase, while the movable contact for each pole con-sists of a U-shaped copper piece fastened to the end of a stoutwooden rod. The wooden rods are fastened at their upperends to a common cross bar, which, through a system of levers being adjacent to the main oil switches and similar in ap-pearance. SWITCHBOARD PANELSOne-third of the total number of sub-stations supply currentto two or more contingent or independent railways, making itnecessary to meter separately the power supplied to each road,whether for traction, tunnel and station lighting or use of an insulated return, iry addition to these meteringrequirements, makes the construction and operation of the low-. FIGS. 57 AND 58.—TWO REAR VIEWS OF THE CHARING CROSS SWITCHBOARD giving a straight line of motion, is raised by means of the leversassisted at the beginning of its motion by a pair of balancingsprings. A toggle joint automatically locks this system oflevers when the switch is in a closed position. The toggle isreleased by a blow from the tripping magnet, which, by gravityand the assistance of a powerful spring, causes the cross barwith the movable rods and contacts to drop to the open oil tanks are constructed of heavy sheet metal, the interiorbeing lined with insulating cement, and each is provided witha small sight gage to show the oil level. The feeder and rotaryswitches, respectively, are automatically tripped by reverse cur- tension switchboard much more extensive and complicated thanis usually the case for this class of work. All panels are of blueVermont marble and somewhat wider than the usual standardpractice, owing to the double-
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
