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 |
| 6792690 | Inside micrometer An inside micrometer including an inside micrometer body (1) with a first spindle (11) screwed in an advanceable and retractable manner in an axial direction, to which anvil (30) having different length in increments of a predetermined dimension... | 09/21/2004 |
| 5377417 | Thread pitch cylinder gage A thread pitch cylinder gage for an internally threaded bore in a workpiece, according to one embodiment, includes a gage post having a bearing surface extending through an externally threaded sleeve. The sleeve is trapped on the bearing surface by a reta... | 01/03/1995 |
| 5063687 | Adjustable measuring parallels The adjustable measuring parallel has a head assembly that includes upper and lower slider blocks that are mated to each other at an incline, which may be a common transversal incline. The upper slider block is connected to a movable extender rod member w... | 11/12/1991 |
| 4977681 | Bore Gauge A bore gauge having a fixed and an opposing automatically-adjustable contact anvil, each such anvil having an extended length in the direction of the axis of the bore being gauged, the gauge having a body about which is adjustably secured a reference plat... | 12/18/1990 |
| 4965936 | Thread pitch cylinder gage A thread pitch cylinder gage for an internally threaded bore in a workpiece, according to one embodiment, includes a gage post having a bearing surface extending through an externally threaded sleeve. The sleeve is trapped on the bearing surface by a reta... | 10/30/1990 |
| 4949469 | Temperature-compensated quantitative dimensional measurement device with rapid temperature sensing and compensation A computerized gauge measures dimensions, typically in the range of 6.1865" to 6.1917" accurate to &#b1;0.001", typically the diameter of a steel railroad car axle. The gauge simultaneously senses the temperature, typically within a range of -20° F. to 1... | 08/21/1990 |
| 4885845 | Inner diameter measuring machine The present invention relates to an inner diameter measuring machine, wherein a displacement measuring and displaying device provided with a group of first switches for setting measuring conditions are disposed on the generally central portion of a main c... | 12/12/1989 |
| 4872269 | Automatic cylinder profiling gage An automatic cylinder profiling gage system comprises a measuring head adapted to fit into a cylinder and including a number of transducers associated therewith, each transducer generating a positional signal corresponding to the distance from the head to... | 10/10/1989 |
| 4866855 | Gaging head for use on dial bore gages A gaging head assembly for use on dial bore gages and the like for gaging the diameter and surface characteristics of cylindrical work surfaces including an elongated tubular member having first and second end portions and an opening extending therethroug... | 09/19/1989 |
| 4547970 | Thread anvils for inside micrometer A thread gauge which attaches to an inside micrometer to measure the thread pitch diameter of internally threaded parts. A pair of anvils have external threads which match in pitch with the threads of the part. Each anvil has a bore which receives a ball ... | 10/22/1985 |
| 4461084 | Internal measuring gauge The disclosed invention is an internal measuring gauge having a stationary jaw, a bridge member, a pair of shafts each affixed between the stationary jaw and the bridge member parallel one to the other. In addition, there is a sliding jaw mounted on the t... | 07/24/1984 |
| 4253241 | Bore gauge A bore gauge for measuring the internal diameter of tubes comprises at least two concentrically and rotatably arranged members connected by a helically wound spring member. The spring member is capable of contacting the inside surface of the tube and caus... | 03/03/1981 |
| 4223444 | Acoustic micrometer An acoustic micrometer for measuring the exact distance between two electrically interconnected metallic objects is disclosed. The micrometer comprises a micrometer head having an electrical contact at one end adapted to engage one of the metallic objects... | 09/23/1980 |
| 4206548 | Measuring tool for taper bores A tool for measuring different details of conical bores comprising a straight elongated member adapted for close engagement against the wall surface of the bore, and having at one end a stop for limiting the length to which the said straight, elongated me... | 06/10/1980 |
| 4136456 | Hole gauge The present invention relates to a hole gauge for measuring the inner diameter of a hole, which gauge comprises an axially movable spindle; a pair of tapered surfaces movable together with said spindle; a pair of contact points radially movable with respe... | 01/30/1979 |
| 4118867 | Micrometer head for internal measurement instrument In a micrometer head for an instrument for measuring internal dimensions there is included a casing in which at least one measurement contact piece having an inclined base is radially mounted in a slot or groove. The contact piece is driven by the axial d... | 10/10/1978 |
