Clothes Boiler Small 261×320 Medium 521×640 Large 834×1024 Download Tiff Original 1955×2400 | (346.8 KB) Description Most boilers consist of a rotating drum called a tumbler through which heated air is circulated to evaporate the moisture from the load. The tumbler is rotated relatively fast in order to maintain space between the articles in the load. Keywords absorb, Boiler, clothes dryer, clothing, Dry, dryer, evaporate, Heater, tumble dryer Galleries Appliances Source: Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)