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 |
| 4894925 | Extendable level An extendable level consists of two interslidable parts having a track and slide strips in a simple construction, wherein there is always a planar relationship between the level edges. The slidable extension rests within the length of the main body when u... | 01/23/1990 |
