. Electric railway journal . g Company is insertedin trolley wires where it is desirable to energize a sec-tion when the trolley passes onto it and to de-energizeit when the trolley passes off. It is used extensivelyin mining installations where a branch is to be ener-gized only when the locomotive is on that losses and dangers of contact by persons pass-ing under the trolley wire are thereby averted when thelocomotive is not on the branch. Electric railwayssometimes use such insulators in the same way. As illustrated, the circuit is opened and closed by aswitch blade mounted on
. Electric railway journal . g Company is insertedin trolley wires where it is desirable to energize a sec-tion when the trolley passes onto it and to de-energizeit when the trolley passes off. It is used extensivelyin mining installations where a branch is to be ener-gized only when the locomotive is on that losses and dangers of contact by persons pass-ing under the trolley wire are thereby averted when thelocomotive is not on the branch. Electric railwayssometimes use such insulators in the same way. As illustrated, the circuit is opened and closed by aswitch blade mounted on a rocker that the trolleyoperates. In one position the blade connects with cop-per contactors. In the other there is no connection. A brass plunger pressing against a steel roller gives aposition centering action and prevents the rocker fromremaining in an intermediate position. There is noarcing at the switch contact, because the rocker is al- Split chuck to fTTfyhold trolley wire Sherardized stee/supporting lug. ImpTegnate^W^, Mlhicknrv bar F 42 ~1 i dia hole Shewed 6ar VIEW Malleable iron Sorlnd Woven copper bond clamping nut Confact * -I _- and wedge jaws\5^\ |M ^ | I v
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishernewyorkmcgrawhillp
