. Electric railway journal . a complete in-stallation is shown in Fig. 7. Views of several street-box mechanisms are shown in Fig. 9. In general the operation of the switch tongue is ac-complished by means of solenoids located in the streetbox, but a recently developed type does this by means of vertical position substantially as they were in the earlytype shown in Fig. 3, although the means for actuatingthe switch tongue are radically different. Electric Switches in UndergroundConduit Operation The application of electric switching devices to under-ground conduit systems on surface lines pres
. Electric railway journal . a complete in-stallation is shown in Fig. 7. Views of several street-box mechanisms are shown in Fig. 9. In general the operation of the switch tongue is ac-complished by means of solenoids located in the streetbox, but a recently developed type does this by means of vertical position substantially as they were in the earlytype shown in Fig. 3, although the means for actuatingthe switch tongue are radically different. Electric Switches in UndergroundConduit Operation The application of electric switching devices to under-ground conduit systems on surface lines presents somedifficulties not found in ordinary surface operation, sinceit is necessary to operate the leaves of the conduit slotin conjunction with the switch tongue, thus requiringthe movement of the additional weight of the consequence a very powerful and rugged apparatusis needed. A drawing of the mechanical connectionsof the principal type of apparatus in general use on 690 Electric Railway Journal Vol. 52, No. 16.
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