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 |
| 6659196 | Core orientation An upper end (10) for the inner tube of a core drill has a marking device comprising a pendulum (350) or hard ball (30) which runs in a circumferential track (24). The marking device adapted to be carried within a tubular upper end casing (12) which surro... | 12/09/2003 |
| 4883131 | Core orientation system A core orientation device for determining the in situ orientation of core samples taken during a drilling process. A sampling tube having a plurality of equispaced slots formed longitudinally on its sidewall permits the scribing of a longitudinal line on ... | 11/28/1989 |
| 4594784 | Apparatus for drawing an ellipse using a piece of string An arm extends out over the surface on which the ellipse is to be drawn, from a support in the form of a base plate with a handle that can be grasped to hold the support in a desired position. A piece of string is slackly fixed at two space sites along it... | 06/17/1986 |
| 4292590 | Magnetometer apparatus with detector immobilized in wax A magnetometer assembly wherein a magnetometer detector suspended from a gimbal is immersed in a wax so as to immobilize the detector. Desired gimbal operation is achieved by heating the wax in the vicinity of the detector.... | 09/29/1981 |
