Abstract: For the measurement of accelerations, e.g. gravitation components for goniometry, in the oscillating circuit of two RC oscillators capacitors are provided, which in a common, metallic casing between two electrode plates (2,3) have a spring-elastically held, common, circular deflection part. In order to avoid dielectric interference, the electronic means are arranged on one side of the instrument, are surrounded by a metallic cover and their electrical connection to the more remote electrode plate takes place by a wire, which is passed in contact-free manner through a central hole in the circular deflection part and the closer electrode plate. The spacing between the deflection part and the electrode plates remains constant in the case of a non-deflected deflection part, in that its size forms a ratio .sub.E - .sub.M : .sub.M to the thickness of the spacers insulating the electrode plates from the metallic casing, .sub.E corresponding to the thermal expansion coefficient of the spacers and .sub.

Abstract: The measuring arm of a multiple coordinate measuring machine has two horizontal arm portions and a vertical arm part. The vertical part free end has a chuck for rigidly connecting a probe member to the measuring arm. The arm part and arm portions comprise pairs of parallel bender bars having rectangular cross-sectional configurations. A corrugated tube can surround the bars to increase the torsional stiffness of the measuring arm. Non-bendable bars freely project between each bender bar pair and carry at their free ends capacitor plate pairs forming differential capacitor primary elements. The outer electrode pairs fixed to the bender bars. Geometrical measurement with respect to the coordinate axes can be performed with two pendulums by movement of the measuring slides of the measuring machine carrying the measuring arm. The test signals of the primary elements are generated by bending movements of the measuring arm in the respective coordinate directions.

Abstract: An air bearing body has an air supply aperture opening in the center of a planar bearing surface. Shallow air circulation ducts extend spirally outwardly in the bearing surface from the air supply aperture balancing pressure in the air gap between the bearing surface and a mating bearing surface and preventing tilting forces on the bearing body. An annular air removal duct can surround the bearing surface and can be connected to a section line to contribute to the constancy of the height of the air gap between the bearing surface and a mating bearing surface.