. The Street railway journal . SECTIONS OF THIRD-RAIL SHOE Street Riiilway Jonru:iI 404 STREET RAILWAY JOURNAL. [Vol. XXL No. ii. to ground. Tliis current often reaches a value as high as 8amps, or lo amps., causing an arc which is likely to be self-. VIEVV SHOWING PRESENT rillRD RAIL AND OLD OVERHEAD CONSTRUCTION maintaining. To avoid this, magnetic blowouts have beeninstalled on the main jaws of the switch. A peculiar feature ofvalue of the switch and a modification which was found to benecessaiy over the original design is the top governor. Theswitch requires to be set so as to fall open wh
. The Street railway journal . SECTIONS OF THIRD-RAIL SHOE Street Riiilway Jonru:iI 404 STREET RAILWAY JOURNAL. [Vol. XXL No. ii. to ground. Tliis current often reaches a value as high as 8amps, or lo amps., causing an arc which is likely to be self-. VIEVV SHOWING PRESENT rillRD RAIL AND OLD OVERHEAD CONSTRUCTION maintaining. To avoid this, magnetic blowouts have beeninstalled on the main jaws of the switch. A peculiar feature ofvalue of the switch and a modification which was found to benecessaiy over the original design is the top governor. Theswitch requires to be set so as to fall open when the cur-rent reaches a certain predetermined minimum, and this isa matter which is likely to vary if the section leaks. The forcetending to throw the switch down is made up of its weight andthe pressure on the jaws. The top plunger is arranged to beraised or lowered at will and clamped with a nut. In this waythe pressure on the jaws and consequently the throw-downpressure can be balanced off by any magnetic force exerted bythe jaw. Ilius the switch can be set to fall open at any cur-rents within the limits of adjustment. The upper plunger is bored out to receive an interior brassplunger, the lower end of which projects beyond the base of th
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectstreetr, bookyear1884
