| 摘要 |
521,381. Heating water by electricity. HEATRAE. Ltd., SMITH, C. H., and ELLIS, C. Dec. 16, 1938, No. 36698. [Class 39 (iii)] A heating element s in a heat-insulated tube p depending into a water container heats a small quantity of water admitted to the tube through a restricted bottom orifice o and drawn off through a pipe w<SP>1</SP>, which, when a large quantity of hot water is required, is placed by a valve y in communication with the top of the container through a branch x. The temperature of the water in the tube is controlled by a thermostat t.
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