[Electric engineering.] . fig. 7. air in the confined space, together with the cooling actionof the porcelain walls, extinguishes the arc. If the pressureto be handled is very high, a number of these cylinders areconnected in series, thus producing a long break. Fig. 7 (a)and (b) shows a switch of the plunger type that is intendedfor a two-phase dynamo or circuit. This switch gives adouble-pole double break in each phase. The cylinders 1,2, 3, etc. and plungers 1, 2, S: are mounted on the back ofthe board and are operated by a lever L on the front. The § 17 ELECTRIC LIGHTING. 7 switch must acc
[Electric engineering.] . fig. 7. air in the confined space, together with the cooling actionof the porcelain walls, extinguishes the arc. If the pressureto be handled is very high, a number of these cylinders areconnected in series, thus producing a long break. Fig. 7 (a)and (b) shows a switch of the plunger type that is intendedfor a two-phase dynamo or circuit. This switch gives adouble-pole double break in each phase. The cylinders 1,2, 3, etc. and plungers 1, 2, S: are mounted on the back ofthe board and are operated by a lever L on the front. The § 17 ELECTRIC LIGHTING. 7 switch must accommodate 4 dynamo wires and 4 line wires,hence there are 8 cylinders, thus giving a double break ineach line. The path of the current will be understood byreferring to the arrows. In the figure the switch is. shownthrown out, but when the plunger is in, bushings a and b,c and d are connected together, and the path of the currentis a-b-c-d-e to line. When the plunger is withdrawn thearc is broken between a and b, c and d.
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