. Electric railway journal . lves. These spools makecontact automatically when slidinto place between two porcelaincheeks which contain the springconnections that make the contactbetween the coils and the spools are interchangeable,and to remove any or all of themit is only necessary to take off theheat fuse plate, requiring lesseffort than to replace an ordinaryinclosed fuse. The heater wire proper is ahigh-grade, non-corrosive alloywhich has a temperature coeffi-cient of nearly zero. Such sizesof wire are chosen that the tem-perature under normal operat-ing conditions never rises ab
. Electric railway journal . lves. These spools makecontact automatically when slidinto place between two porcelaincheeks which contain the springconnections that make the contactbetween the coils and the spools are interchangeable,and to remove any or all of themit is only necessary to take off theheat fuse plate, requiring lesseffort than to replace an ordinaryinclosed fuse. The heater wire proper is ahigh-grade, non-corrosive alloywhich has a temperature coeffi-cient of nearly zero. Such sizesof wire are chosen that the tem-perature under normal operat-ing conditions never rises above 600 deg. Fahr. Under these conditions the wire attainsonly 33 1/3 per cent of the allowable temperature atwhich it could be worked indefinitely. In order to meetthe underwriters requirements provision is made forbreaking the heater circuit by heat fuses when the airsupply fails. Under normal operating conditions theseheat fuses carry the current for which they are in-tended, but will fuse and cut off the current when the. VIEW OF THERMOSTAT 900 ELECTRIC RAILWAY JOURNAL [Vol. XLVIII, No. 17
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