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 |
| 4377116 | Furnace for burning husk A husk burning furnace having a husk smoke-burning chamber formed by an inner peripheral perforated wall defining a pot-shaped primary gas burning chamber and an outer peripheral perforated wall surrounding the inner peripheral perforated wall. Means are ... | 03/22/1983 |