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 |
| 5173588 | Food consumption monitor Food consumption monitor comprising a simple mechanical calculator integrated into a diet guidebook. The calculator includes a manually operable rotary dial with a scale pointer on it, a base for the dial, a means for rotatably mounting the dial to the ba... | 12/22/1992 |
| 5026973 | Number wheel counters A number wheel counter has a worm wheel connected with the least significant number wheel. A worm gear engaged with the worm wheel is mounted for both rotational and translational movement about a spindle. Cam means are provided such that as the worm gear... | 06/25/1991 |
| 4960980 | Bioclock calculating device for human body A new type of bioclock calculating device for the human body comprising a ring, a set of discs and some accessories. They are marked with data graduation, age graduation and curves showing the cycles of physical, emotional and intellectual (PEI) rhythms. ... | 10/02/1990 |
| 4108357 | Feed-rate indicator for electrochemical grinding An electrochemical grinding process is controlled by the use of a feed-rate indicating device which calculates and displaces the feed-rate (V) of a workpiece and a grinding wheel which are displaced relatively toward one another. The feed rate V is determ... | 08/22/1978 |
