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 |
| 6454539 | Personal fan system A personal fan generally comprises a source of electrical power such as, for example a power supply unit and a fan motor with one or more blades dependently supported by an adjustable arm. A tilt switch is provided for novel functionality for the personal... | 09/24/2002 |
| 5640992 | Pressure gauge capable of automatically stopping supply of pressure from a pressure source A pressure gauge includes a housing, a Bourdon tube with a closed end, an adjustment rod mounted rotatably in the housing, a microswitch installed on the adjustment rod, a gear, a sector wheel meshing with the gear, and a crank member interconnecting the ... | 06/24/1997 |
