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500 degrees F amount of energy average efficiency bake a sponge baking period Blue Enamel bottled gas British thermal units cent center front city gas compare the different Cooling curves cost and oven cost to preheat cubic foot cycle DEGREES F Figure different ovens electric ovens varied electric range ovens energy input energy required fuel gas and electric Gas Engineering Laboratory gas ovens gas range gas was determined H was lowest heat distribution heat units inches of inside Indiana rural homes inside oven surface kilowatt-hours maintain a given Maintain Empty Bake Mineral Wool Operated—Degrees F operation costs Oven D cost oven empty oven F highest oven H oven heat oven temperature oven thermostat potentiometer Preheat and Bake preheat the oven radiation losses required to preheat rheostats shown in Table sponge cake surface units tempera TEMPERATURE DEGREES thermal efficiency thermocouple points Thermostat Operated—Degrees thousand square inches total cost ture Watt Hours wattmeter