Rotary Water Heater
Water heating is a thermodynamic process using an energy source to heat water above its initial temperature. Typical domestic uses of hot water are for cooking, cleaning, bathing, and space heating. In industry, both hot water and water heated to steam have many uses.
Government Printing Office Official Gazette (Washingon, DC: Government Printing Office, 1912)
Courtesy the private collection of Roy Winkelman