. Electric railway journal . -ating spring is inclosed in the extreme back part of thecase. All parts are made sufficiently rugged to withstandthe abuse which such a device usually gets in service. Thecase is made of malleable iron, enameled. A large openingis provided at the bottom to drain off moisture. A sepa-rate base casting is bolted directly to the car dash, and thecatcher can be quickly inserted in the base and held inplace by a spring operated catch. For double-end opera-tion a base is installed on each end of the car, and onecatcher is used. July 26, 1913.] ELECTRIC RAILWAY JOURNAL 1
. Electric railway journal . -ating spring is inclosed in the extreme back part of thecase. All parts are made sufficiently rugged to withstandthe abuse which such a device usually gets in service. Thecase is made of malleable iron, enameled. A large openingis provided at the bottom to drain off moisture. A sepa-rate base casting is bolted directly to the car dash, and thecatcher can be quickly inserted in the base and held inplace by a spring operated catch. For double-end opera-tion a base is installed on each end of the car, and onecatcher is used. July 26, 1913.] ELECTRIC RAILWAY JOURNAL 149 A SIMPLE ELECTRIC THERMOSTAT The problem of heating surface cars is one which isaffected by many indefinite factors. Variations in tem-perature are caused by the opening of doors, by thechanges in the number of passengers within the car andby the variations in outside temperature. Automatic con-trol of heaters has in consequence been generally recog-nized as a desirable condition if it can be obtained without Resistance A. Through Heatersto GroundElectric Ri/ Journal Electric Thermostat Control for Car Heaters excessive complication. The reasons are, obviously, in-creased comfort of passengers, the elimination of disputesbetween passengers and conductors as to whether heatersshould be turned on or off and the saving in current forthe heaters which can be effected by using heat only whenit is needed. A simple thermostatic system for the regulation of elec-tric heaters has been developed by the Railway UtilityCompany of Chicago in order to meet these conditions. Itsaction is dependent primarily upon the use of a ther-mometer with two platinum contact points fused into theglass by means of which the mercury column can be madeto make or break a control circuit as the mercury risesabove or falls below the upper platinum point. The ther-mometer is otherwise similar to any accurate mercury ther-mometer except that a special grade of glass is used forthe tube so that it will not exp
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