. American engineer and railroad journal . channelswhich are secured to cast-iron yokes. Steel plates are placeddirectly upon the top of the yoke with one side turned at rightangles to form the drip into the conduit. The insulators supportmalleable castings, on which lips are provided to close aroundthe conduit feeder tubing, which is of iron pipe lined withtreated wood. The conductor rails are bolted to malleable castings, and theconductors are bonded at the ends by heavy flexible copperstrips. Provision is made for contraction and expansion in thejoints, and also for slight movements of the
. American engineer and railroad journal . channelswhich are secured to cast-iron yokes. Steel plates are placeddirectly upon the top of the yoke with one side turned at rightangles to form the drip into the conduit. The insulators supportmalleable castings, on which lips are provided to close aroundthe conduit feeder tubing, which is of iron pipe lined withtreated wood. The conductor rails are bolted to malleable castings, and theconductors are bonded at the ends by heavy flexible copperstrips. Provision is made for contraction and expansion in thejoints, and also for slight movements of the insulators. Thetrolley contacts are made by two springs of flat steel on springbases. They carry cast-iron shoes on their lower ends for making contact with the conductor rails, and as they are simpleand inexpensive, renewals may be cheaply made. The springsare carried in opposite directions at their lower ends; theypass through and are supported in insulating material, whichis protected by the steel covering, this being fitted loosely in. the base, which is permanently secured to the car truck. Thesprings are fastened at the top by means of the insulating fiberstrips and pass loosely through the insulations of the casing. The trolley is raised from the slot by means of the handleon the top of the Insulating strip. This raises the springs anddraws the shoes away from the conductor rails and brings themtogether at the bottom of the casing. The casing and the shoesare then drawn from the slot. In this system manholes are pro-vided from 300 to 500 ft. apart. In these the fuse connectionsare placed and provisions are made for draining the conduit intothe sewer. The fuse connections are made with heavy copperwire on insulated screw handles which may be readily detachedor replaced without danger. The conductor rails end at themanholes and at these points they are connected to the feedersthrough the fuses. This construction renders it easy to locatedefective insulation, it also preven
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectrailroadengineering
