Abstract: To improve the corrosion resistance of ferrous metal parts containing free r combined sulphur on the surface, the parts are immersed in a bath of molten oxidizing salts at between 350.degree. C. and 450.degree. C., the bath typically having a composition by weight of 60% of potassium hydroxide, 30% of sodium nitrate and 10% of sodium carbonate. Between 0.5% and 15% of oxygen-containing salts, the normal oxidation-reduction potential of which is less than or equal to -1 volt, relative to the hydrogen electrode, such as alkali metal dichromates, permanganates, peroxycarbonates, iodates and periodates, are added to the bath, and an oxygen-containing gas is blown into the bath with an oxygen flow of between 1.5 and 7.5 liters/hour per 100 kg of bath. The molten salts of the bath are filtered continuously through an iron gauze filter cartridge in a furnace, the molten salts being transported into the filter cartridge by entrainment of the salts in a pipe by bubbles of air blown in through the pipe.

Abstract: The invention pertains to an electric control weapon.A condenser is charged by a battery through an electrical circuit including n integrated circuit, a transistor, a transformer and a diode. As the trigger of a thyristor is activated, the condenser is suddenly discharged into an electrical cap of the cartridge, so as to fire it. This invention provides a more accurate and reliable weapon.

Abstract: A method of treating a part which contains titanium in its outer surface luding the steps of removing a portion of the natural oxide layer, placing the part in an enclosure, evacuating the enclosure, isolating the evacuated enclosure, and introducing oxygen in an amount ranging from 10.sup.-3 to 2.55 milligrams for each square centimeter of total outer part surface area, and heating to a temperature from 450.degree. C. to 880.degree. C.

Abstract: An antifriction alloy containing iron, molybdenum and sulphur, and having a low coefficient of friction, even in the dry state, is disclosed. The alloy contains 8.0-26.6% iron, 41.0-62.5% molybdenum and 23.3-40.5% sulphur. The alloy may comprise a matrix of Fe.sub.x Mo.sub.3+y S.sub.4, where x and y are less than 1. (e.g. FeMo.sub.4 S.sub.5) in which is dispersed FeMo.sub.2 S.sub.4 and/or the .epsilon. phase of the Fe/Mo/S equilibrium diagram. The alloy reacts with a material against which it rubs, to form the sulphide of that material on the rubbed surface. The alloy may be made by chemical reaction, fusion, vacuum deposition, or powder metallurgy. It can be used alone, or as a surface layer on, or inclusion in, another material, or it can be dispersed as a powder in a lubricant.

Abstract: The invention is a fluid discharge valve wherein the force necessary to mtain the valve in a closed position in the absence of fluid pressure is kept at a very nominal pressure. The fluid discharge valve further provides for the force on the valve body to increase proportional to the pressure up to a pre-determined value. At this pre-determined value, means are provided to open the valve and thereby allow fluid to pass. The invention provides for a discharge valve which maintains its initial calibration, as well as avoids the valve body and valve member to be exposed to a high closing force in the absence of fluid pressure. Further, means are provided to allow for selecting the pre-determined value.

Abstract: A continuous transport system for serving an urban region, for example, for ublic transport. The transport system includes at least one looped main track which cooperates with at least one station track. The main track conveys platforms with removable cabins disposed thereon at a constant speed, and the cabins are adapted to be transferred to similar platforms provided on the station track. The station track varies the speed of the cabins therealong to permit embarkation and disembarkation therefrom.

Abstract: The invention relates to a method of maintaining at very low values the portions of cyanides in molten-salt baths of the kind in which the main active principle is the cyanate anion CNO.sup.-, the method comprising essentially the steps of conjointly providing in the salt bath at least one sulphurized element in a quantity such that the proportion of the sulphur element in the bath is between 0.001 and 0.1 % of the weight of said bath, and introducing periodically or continuously into the bath at least one substance comprising at least one carbonyl group = C = O in its chemical formula, in a quantity such that it corresponds to a weight of between 1 and 25 grams of CO per kg. of bath and per 24 hours maintenance at the bath working temperature of between 480.degree. and 650.degree. C. The substance introducing the carbonyl group may also constitute a regenerating agent for the cyanate anion and can advantageously be obtained by baking carbamide for 3 to 10 hours at a temperature of between 150.degree.

Abstract: Mechanical parts of ferrous alloys are provided with a coating consisting essentially of FeSn.sub.2, FeSn and FeSnC.sub.x with x ranging from 0.7-1.3 by holding the part to be treated in an oven at a temperature ranging from 400.degree. to 700.degree. C while the gaseous atmosphere inside the oven is comprised of a mixture of a vapor of a tin halide and a reducing gas.