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Comparison with older types of furnaces.-In marked contrast with the oil, coal and gas furnaces the electric furnace eliminates damaged ware and makes possible the utilization of the entire heating space. Its initial cost and the fuel costs are double those of the older types but it admits 25 per cent increase in weight per charge and 30 per cent in charges per hour. Description and operation.-Details of construction are given. The electrical equipment is explained together with the methods ofdoi:10.1111/j.1151-2916.1921.tb17345.x fatcat:vdmfhmfu3vhsfdecibkp4fexvi