Abstract: A powder-metallaurgically produced material or extruded semi-finished product for electric contacts of silver or a silver-based metal material with 0.5 to 10 wt. % carbon and 0 to 2 wt. % of an additional metal. The material contains powdered carbon in combination with carbon fibers in the mass ratio of 10:1 to 1:10, whereby the diameter of the powder particles is on average smaller than half the length of the fibers.

Abstract: The ignition distributor comprises a housing, in which a distributor rotor (4) is rotatably mounted, which comprises a first electrode (9) close to the axis of rotation (5) of the rotor, a second electrode (10) at that end of the rotor which is remote from the axis of rotation, and between said electrodes an electrical line (11), which connects the two electrodes. The housing is closed by a distributor cap (1), which is provided on its inside surface with a plurality of peripherally spaced apart stationary electrodes ( 3 ), which cooperate with the second electrode (10) of the distributor rotor, and also comprises a center electrode (2), which terminates at a small distance from and defines a spark gap with the first electrode (9) of the distributor rotor. One electrode of the pair consisting of the first electrode (9) of the distributor rotor and the center electrode (2) is pinlike and the other electrode (9) does not surround the pinlike electrode (2) or surrounds it around less than its entire periphery.

Abstract: Ceramic plates are described, which are coated with metal at least on one side and suitably on both sides and have an improved resistance to cyclic temperature changes because a ceramic material is used which has a texture that is as low as possible.

Abstract: The apparatus for a continuous selective electrodeposition on a strip comprises a carrier (2), which guides the strip (1) in its longitudinal direction, which are faced by electrolyte discharge orifices (3), through which the electrolyte, which has been discharged by a pump (4) is sprayed onto the strip (1), which is covered by a mask tape (5), The mask tape (5) is provided with at least one row of holes (6) and urges the strip (1) against the carrier (2). The strip (1) is provided with drive means (7) for moving the strip (1) relative to the mask tape (5). The carrier (2) is straight and one or more pressure-applying elements (8), which are parallel to the carrier (2), are associated with the carrier (2) and urge the mask tape (5) against the carrier (2). The carrier and the pressure-applying elements, individually or jointly, define openings (3), which face the electrolyte discharge orifices (3) and overlap the holes (6) of the mask tape (5).

Abstract: A semifinished product for electric contact made from a composite material based on silver-tin oxide is described as well as a powder-metallurgical process of making said product. The structure of the semifinished products contains regions which contain no metal oxide or very little metal oxide in alternation with regions which contain the entire metal oxide component or a greatly predominating/share thereof in a fine division.

Abstract: The electrode consists of a metal carrier (1) and a surface layer (3), which has been deposited on the carrier and has a thickness of 0.1 to 20 .mu.m and consists of a material which differs from the carrier material and distinguishes from the carrier material by having a smaller work function and lower thermal and electrical conductivities and is selected from the group tungsten, niobium, tantalum, rhenium and chromium. The carrier (1) consists of a deeply drawable material. There is preferably also an interlayer (2) made of a highly conductive metal.

Abstract: The distributor comprises a rotatably mounted rotor, which has close to its axis of rotation a first electrode and has at its end that is remote from the axis of rotation a second electrode, which is connected by an electric line to the first electrode. The distributor also comprises a housing, which is closed by a cap, which is provided on its inside peripheral surface with a plurality of peripherally spaced apart fixed electrodes for cooperating with the second electrode of the roto. The cap is further provided on its inside surface with a center electrode, which terminates at a distance from the first electrode of the rotor to form a spark gap therewith. To form a positive joint with the cap the embedded portion of the center electrode has a non-cylindrical peripheral surface, which is rounded and free of any edge.

Abstract: In the method of controlling the wiping interval, the interval of time between two consecutive wiping movements, of which at least the second wiping movement was started arbitrarily, is measured, the measured value is stored and is subsequently used as interval time unless a different interval time becomes stored due to another arbitrary starting of wiping movements, or unless the interval operation of the wiper is interrupted or unless the control circuit is deenergized.

Abstract: The bodies consist of a ceramic slab (1), which is covered on both sides by metal plates (2, 3), which are firmly bonded to the ceramic slab (1) throughout their contact surface without an interlayer and have marginal strips (5) which are reduced in thickness.

Abstract: A process for the preparation of catalysts, in particular for the purification of exhaust gases from internal combustion engines, is described, which makes it possible to use supports stable up to at least 1,200.degree. C. which are free of gamma-aluminium oxide and transition aluminium oxide and nevertheless have a high catalytic activity. The catalytically active noble metal as the constituent of a composite powder is attached to the support, which in addition to the noble metal contains a thermally stable metal oxide and is prepared by the spray pyrolysis process.