Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 6525642 | Self-regenerating liquid metal current limiter A self-regenerating liquid metal current limiter including solid metal electrodes for connection to an electric circuit to be protected and several compression chambers which are partially filled with liquid metal. The compression chambers are located one... | 02/25/2003 |
| 4949064 | Non-linear resistor having a poly (amino acid) membrane A membrane of an ionic pendant-containing, water-insoluble copolymeric poly(amino acid) composed of a first moiety derived from a first amino acid which gives a water-soluble poly (amino acid) with ionic groups of carboxyl and/or amino groups as the penda... | 08/14/1990 |
| 4939500 | Electrode water circulation and processing system and hooded radiator for water rheostat The water rheostat has a main electrode unit including the main electrode shaped as a hollow cylinder and provided with an electrode water inlet port in the top of the hemispherical upper end portion of the electrode, electrode water outlet ports at equal... | 07/03/1990 |
| 4670735 | Liquid rheostat with circulating electrolyte A rheostat of the kind that comprises a tank containing electrolyte and at least two electrodes, one electrode being connectable to an electric power supply and the other electrode being connectable to apparatus to be fed by the power supply. The electrod... | 06/02/1987 |
| 4493973 | Flow controlled electrode type liquid heater An electrode type liquid heater includes a tank having an inlet and an outlet disposed so that in normal operation of the heater the tank is partially filled with electrically conductive liquid below an electrically nonconductive air space. A plurality of... | 01/15/1985 |
| 4326120 | Temperature control system for an electrode type liquid heater An apparatus for heating an electrically conductive liquid, such as water, includes a rotatable, balanced, buoyant heating assembly floating in a quantity of conductive liquid partially filling a tank. A pair of opposite polarity electrodes are mounted on... | 04/20/1982 |
