| 摘要 |
386,221. Heating water by electricity. NAAMLOOZE VENNOOTSCHAP FABRIEK VAN INSTRUMENTEN EN ELECTRISCHE APPARATEN INVENTUM, Bilthoven, Holland. June 8, 1932, No. 16219. Convention date, April 28. [Class 39 (iii).] Water in a closed tank 2 is heated indirectly by water in an inner vessel 3 containing an electric heater 4 ; water enters the inner vessel 3 by overflow from the tank 2 until it reaches the bottom of an air vent tube 5 extending into the vessel 3 so that the water level is maintained constant therein below the top edge.
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