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 |
| 4846601 | Method for mechanically laying a herringone pattern of bricks, and an apparatus to perform it A method and apparatus for laying bricks in a herringbone pattern, in the preferred embodiment by a tongs motion, and for packeting bricks in a herringbone pattern.... | 07/11/1989 |
