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 |
| 6994006 | Movable fence for a machine tool An adjustable rip fence for a machine tool has a fence which is movable with respect to the cutting tool due to a rack and pinion. The rail assembly supporting the fence include a pair of stationary rails which are secure to the machine tool. A movable rail telescop... | 02/07/2006 |
| 6176018 | Positioning device A measuring machine produces an essentially linear movement in a moving part by transforming rotary movement to linear movement through a transmission element having a high modulus of elasticity in a longitudinal direction, and which is flexible in a tran... | 01/23/2001 |
| 5386640 | Drafting device A drafting device includes a pair of magnetic boards securely mounted to upper and lower surfaces of a base frame respectively, a ruler movably engaged on the magnetic board, a pair of cavities defined in each of the four corners of the lower surface of t... | 02/07/1995 |
| 5152069 | Parallel rule A parallel rule which includes a gripper body cover and a rule body, with a gripper body base positioned between them. A plurality of float-contact rollers are installed through respective openings in the rule body and gripper body base. The parallel rule... | 10/06/1992 |
| 4813146 | Method and device for obtaining numerical coordinates of a point or a set of points A device for obtaining numerical coordinates of a point or a set of points comprises two stretched strips having a common end attached to a stylus which is placed on a point or moved over a set of points. Each of the other ends of each strip is supplied f... | 03/21/1989 |
| 4688334 | Apparatus for making perspective drawings Perspective drawing apparatus comprises a straightedge assembly having a blade for guiding a tool and at least one flexible member on a tensioned spool, a free end of the flexible member being connected to an anchor device for location at a vanishing poin... | 08/25/1987 |
| 4622755 | Parallel straightedge A parallel straightedge which may be attached to any drawing table wherein the straightedge is arranged for adjustment and is provided with a braking arrangement to allow the straightedge to be fixedly held in any given position and/or orientation. The bo... | 11/18/1986 |
| 4467528 | Parallel ruler A ruler, especially a parallel ruler having a parallel guidance system comprising a cord (6) extending between four points (A,B,C&D) and crossing itself diagonally in a corner to corner-fashion in the central portion of the ruler, which ruler consists of ... | 08/28/1984 |
| 4445280 | Brake for drafting parallel A braking assembly adapted for attachment to the extremity of a drafting parallel and to the underlying drafting table utilizes a stationary tensioned strand which engages locking means on the drafting parallel. The braking effect is secured by depressing... | 05/01/1984 |
| 4426789 | Navigation position plotter A navigation position plotter for determining the navigation coordinates of a point on a navigation chart and plotting the position of a point on the navigation chart. A plate bearing navigation scales divided into increments between two spaced grid lines... | 01/24/1984 |
| 4390978 | Carriage translating mechanism for video disc player A pickup carriage drive for a video disc player comprises a selective-activated motor mounted on a pickup carriage. A drive cord is strung between a pair of anchor points disposed in the player, and has a portion wrapped around the output shaft coupled to... | 06/28/1983 |
| 4339881 | Parallel-ruling straightedge A parallel-ruling straightedge assembly having a base member adapted to be translated over a drafting surface, a first straightedge member of a transparent acrylic material extending along one longitudinal edge of the base member and adapted to provide a ... | 07/20/1982 |
| 4314407 | Drafting board storage tray A drafting board tray for use in a drafting board having a cable guide track mounting for use with a straight edge assembly slideably adjustable on the cable guide track. The tray is disclosed to be pivotally attached and pivotally adjustably positionable... | 02/09/1982 |
| 4202111 | Drafting apparatus A drafting aid comprising a flat board, the board having two straight parallel edges and guide surfaces at the parallel edges. A flexible member passes about the board and over the guide means. The flexible member includes resilient tension members extend... | 05/13/1980 |
| 4170825 | Scaling parallel bar Disclosed is apparatus for determining distances along a direction in a plane. A base is constrained to translational movement along the direction by a guide system. An indicator is connected to the guide system to move relative to the base corresponding ... | 10/16/1979 |
