Abstract: The invention proposes a device for nebulizing or spraying or injecting liquid into an operating chamber, wherein at least one multi-jet nozzle (1) having at least two jet ducts (2, 3) for generating at least two liquid jets which at least partially impinge on one another in an impingement zone (7), such that a fan-shaped jet can substantially be generated, the extent of which in a fan plane is greater than, or at least twice as great as, the extent in a transverse direction with respect to said fan plane, by means of which device a highly stable and controlled fan-shaped jet is generated.

Abstract: The invention proposes a device for nebulizing or spraying or injecting liquid into an operating chamber, wherein at least one multi-jet nozzle (1) having at least two jet ducts (2, 3) for generating at least two liquid jets which at least partially impinge on one another in an impingement zone (7), such that a fan-shaped jet can substantially be generated, the extent of which in a fan plane is greater than, or at least twice as great as, the extent in a transverse direction with respect to said fan plane, by means of which device a highly stable and controlled fan-shaped jet is generated. This is achieved according to the invention in that a ratio (V) of a length (L) of the one or more jet ducts (2, 3) in relation to a duct diameter (D) of the one or more jet ducts (2, 3) is greater than 5 (V=L/D).

Abstract: A soft protective construction for body protection, such as a bullet-proof vest or shirt is disclosed wherein a double layered bullet-stopping arrangement of mutually moveable rectangular or square protective plates is provided which plates can preferably be inserted into pockets of a carrier material. The outer layer of plates lying on the bullet impact side consists of steel and at least in portions thereof said outer plates are overlapped in scale-like fashion. The inner plate layer, which lies closer to the body than does the outer layer, is designed to absorb or largely destroy the impact energy of a striking bullet.

Abstract: An improved method for the production of castings by the anionic polymerization of lactams, particularly lauric lactam, in which two melts prepared separately, one with a catalyst and one with an activator, are polymerized together in a mold heated to substantially the same temperature as the melts, is described, the improvement comprising the application of a vacuum in the range from about 80 to 450 Torr, said vacuum being selected in accordance with the formula S.times. T= K where S is the surface area of the casting exposed to the vacuum, V is the volume thereof, T is the vacuum application time and is less than the polymerization time and K is a constant. Said vacuum is replaced by ambient pressure either progressively or instantaneously when the polymerization mixture reaches a highly viscous non-stirrable state. Thereafter, the polymer may be heat treated at a temperature about 10.degree. to 20.degree. C.