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 |
| 6980118 | Method and apparatus for measuring stroke rating in rowing The present invention detects the squaring and feathering of an oar during rowing. The time interval between two consecutive feathers is measured, and it is used to calculate the stroke rating. It is mounted to an oar close to the grip of the oar. An enclosure house... | 12/27/2005 |
