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 |
| 4332161 | Acoustic detection of tool wear and fracture For detecting brittle fracture and wear of a tip of a cutting tool an acoustic emission monitoring system has a converter for converting acoustic emission into an electric signal, a filter for rejecting frequency components in the signal below a frequency... | 06/01/1982 |
