Abstract: Precision measuring instruments having highly parallel and wear-resistant contact members and a method for fabricating these contact areas are disclosed. The measuring instruments preferably include two contact members each having diamond coated ceramic substrates. The method for diamond coating the contact members of the measuring instruments includes, for each contact member, preparing a ceramic substrate to high tolerance so that it has two surfaces which are parallel within 0.25 microns, diamond coating one surface of the substrate by any one of several chemical vapor deposition (CVD) techniques, and metalizing the other surface of the substrate for affixing it to the contact member of the measuring instrument. The metalized surface of the substrate is preferably affixed to the contact members of the measuring instrument by brazing, gluing or welding. Preferred embodiments of the measuring instruments with diamond coated contact areas include calipers and micrometers.

Abstract: A device to measure round objects, especially threaded objects is shown where three cam surfaces located on the interior of an annular ring are contacted by rollers which are advanced or retracted as a cam surface is traversed. The traverse of the cam surface allows change in diameter formed by the rollers and by locking the cam position, a fixed gauge is formed. The rollers directly contact the part to be measured. As applied to thread measurement, the three point gauge uses annular rollers to measure properties of thread fit and use when the rollers have the threads slightly offset from each other to make a pitch test set. The device allows a single gauge to handle at least 12 normal go and no-go gauging functions with just change of rollers for various fit and pitch classes. The gauge also is settable at special sizes near a standard size due to a range of adjustment.

Abstract: A contact sensing probe with a cylindrical housing component (1), with a bearing (4) and a hemispherical element (3), possesses a stylus (13) which displaces the hemispherical element (3) and, with that, the transmission element (2). A measured value converter (14) is provided within the contact sensing probe. The running surfaces (1a, 2a) of the housing component (1) and the transmission element (2) comprise high strength ceramic material with a mean roughness value R.sub.a of .ltoreq.0.8 .mu.m, respectively 32 .mu.in. Rotational security is provided not only for the hemispherical element (3) but also for the transmission element (2).

Abstract: This invention relates to a level which detects a level line or horizontal surface. The mixed liquid, composed of a main agent, 2,2-dichloro-1,1,1-trifluoroethane and an additive agent, comprising one or more of a soluble agent selected from the group of methyl alcohol, ethyl alcohol, acetone, hexane, heptane, isoamyl alcohol, allyl chloride, isopropyl chloride, propyl chloride, diethyl ether, dipropyl ether, pentane, methyl hexane and silicon oil, is contained and sealed, having a ratio of about 60:40 to about 70:30 between the main agent and the additive agent, with the dyestuff in a transparent heat-resistant tube.

Abstract: A method of making a ceramic material by radiating a laser beam onto the portion of said ceramic material to be marked in a low oxygen atmosphere and a block gauge marked by this marking method. This marking method enables a ceramic material to have a distinct mark. A block gauge composed of a ceramic material has excellent properties such as corrosion resistance.

Abstract: A measuring device for measuring the thickness of fiber bundles such as slivers or the like on high output speed drawing frames within a predetermined tolerance range. The fiber bundle thickness is measured by a pair of rollers, one of which is supported for rotation about a fixed axis and the other of which is supported for rotation about a movable axis which permits it to move towards and away from the roller on the fixed axis. At least one of the rollers is composed of a material having a low coefficient of heat expansion under the temperatures generated when the bundle of fibers passes between the pair of rollers at high production output speeds. This avoids distortions in the measurement of the thickness of the fiber bundle.

Abstract: A position measuring device for measuring the relative positions of two objects. A scanning unit for scanning a graduation carrier is mounted on a bed of a processing machine through a coupling which is stiff in measuring direction. The coupling includes a first coupling part in the form of a plate fastened to the scanning unit and a second coupling part in the form of a pin having a spherical end face. The pin is fastened to an engagement member mounted on the bed of the processing machine. A sliding layer is provided between the two coupling parts in order to eliminate wear between the two coupling parts and to eliminate measuring inaccuracies.

Abstract: A box beam comprises at least two elongated component blocks of granite, each containing at least one flat surface, the flat surfaces having identical dimensions. Igneous rock material is removed from the flat surface of at least one of the component blocks so as to form at least one open cavity in that component block. The interior cavity has boundary walls of a predetermined, though not necessarily uniform, thickness. The two component blocks are then bonded together along the remaining unremoved portions of the flat surfaces so as to form a box beam.The system described above for manufacturing hollow granite box beams reduces weight while maintaining stiffness comparable to that of the composite ceramic or metal beams along with the inherent stability of granite, e.g., low coefficient of thermal expansion, in a highly efficient manufacturing process.

Abstract: A test gage for measuring the decrease in one dimension of a test specimen having a frame member with a sliding member positioned within the frame member. The test apparatus is adapted to receive a test specimen between the sliding member and one side of the frame member. The sliding member is held in contact with the test specimen by a spring. A proximity measuring device senses the position of the sliding member with respect to the frame member and provides an output signal proportional to displacement. Elastic bands are used to support the test gage on a tensile test machine which is used to apply a stress to the test specimen.