. Electric railway journal . Underwriters Approve ThermostatControl The Underwriters Laboratories have rendered a re-port on the new system of thermostat control for elec-tric heaters introduced during the past year by theConsolidated Car Heating Company. This control com-prises a mercury thermometer which, through a ruggedrelay, operates a magnetic switch. The thermostat andthe switch, with cover removed, are shown in the ac-companying MERCURY THERMOSTAT AND MAGNETIC SWITCH, WITH COVERREMOVED, FOR ELECTRIC HEATER CONTROL The conclusions that were reached by the investiga-tors who r
. Electric railway journal . Underwriters Approve ThermostatControl The Underwriters Laboratories have rendered a re-port on the new system of thermostat control for elec-tric heaters introduced during the past year by theConsolidated Car Heating Company. This control com-prises a mercury thermometer which, through a ruggedrelay, operates a magnetic switch. The thermostat andthe switch, with cover removed, are shown in the ac-companying MERCURY THERMOSTAT AND MAGNETIC SWITCH, WITH COVERREMOVED, FOR ELECTRIC HEATER CONTROL The conclusions that were reached by the investiga-tors who reported on the device for the UnderwritersLaboratories are as follows: 1. Construction. The parts of this system are ofrugged construction, and are judged to be so designedas to be properly safeguarded for use in automaticallycontrolling the temperature in street cars. The designprovides for the use of standard materials and the in-closure in metal of the controlling operating partsthroughout. 2. Operation. The circuit breaker is capable of car-rying and breaking successfully and without undue haz-ard, current of the value for which it is rated. Thisconclusion is based upon the result of an operating testquoted in this report. This new control is now operating successfully onmore than 2000 cars, which is evidence of the indorse-ment by railroad officials of the manufacturers claimthat the use of the control results in economic use ofenergy
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