[Electric engineering.] . S, 4- These are made of hardrubber or similar material andare grooved so as to make theleakage path from the switch partsto the panel as long as insulating material passesthrough the panel, so that in noplace does the metal switch studcome in contact with the is a necessary precaution incases where very high pressuresare handled, because the marblecannot be depended on to givegood enough insulation. The blades A, B are arranged asdescribed in connection with Fig. 4, except that blade Ahas a hole in the end instead of a handle. The switch ispu
[Electric engineering.] . S, 4- These are made of hardrubber or similar material andare grooved so as to make theleakage path from the switch partsto the panel as long as insulating material passesthrough the panel, so that in noplace does the metal switch studcome in contact with the is a necessary precaution incases where very high pressuresare handled, because the marblecannot be depended on to givegood enough insulation. The blades A, B are arranged asdescribed in connection with Fig. 4, except that blade Ahas a hole in the end instead of a handle. The switch ispulled open by means of a hook in the end of a handle about3 feet long, thus allowing the attendant to stand back somedistance and avoid the danger of his being burned by thearc. To avoid arcing from one switch to the next, marblebarriers C are mounted at right angles to the main part ofthe board. Each switch is thus placed in a cell by itself,and arcing across from one switch to its neighbor cannottake place. J. III.—19. Fig. 6. 6 ELECTRIC LIGHTING. 17 5. The Westinghouse Company make use of a high-tension switch in which the terminals are mounted at eachend of a porcelain cylinder. A copper rod or plungerpasses through these contacts or bushings and completesthe circuit. When the plunger is withdrawn, the arc isformed in the confined space between the bushings. A smalloutlet is provided in the side of the tube, and when the arcis formed, the blast caused by the sudden expansion of the
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Keywords: ., bookcentury1900, bookdecade1900, bookidelectricengi, bookyear1902
