Abstract: A method of locating a leak in a block of pipes comprises the filling of the pipe with inert gas and the sealing of the pipe. Thereafter, suction is applied to the pipe for drawing air or atmospheric gas into the pipe through the leak. Care is taken to insure that the block of pipes is sealed, except for the suction port and the leak position. Once a layer of air or atmospheric gas is established in the pipe near the leak position, inert gas is drawn from the pipe by the pump, in a direction toward an oxygen or atmospheric gas sensor. By doing this, the layer of air or atmospheric gas is moved along in the pipe from the leak position toward the oxygen sensor. A measurement is taken of the volume of gas being drawn while the layer of air or atmospheric gas is being moved along the pipe. The oxygen or atmospheric sensor indicates when the layer of air or atmospheric gas has arrived.

Abstract: A method for the manufacture of a guide blade for a turbine or compressor guide wheel, uses a profiled bar of heat and corrosion resistant metal that is cut to oversize length. This is in preparation for soldering the bar into a guide wheel, with the bar having at least at one end a baselike thickening which is upset in a cold state, and with a soldering surface formed in its inner zone.

Abstract: An apparatus to compensate for the thermal expansion of a component inserted between two elements, particularly an explosive member placed between a lining, and a cover plate in a shaped charge, comprises two rings that are in contact with one another through conical inner and outer surfaces. The ring with the conical outer surface is made of a material that has a lower coefficient of thermal expansion than the material of the ring with the conical inner surface. So that the apparatus expands upon reduction in temperature and contracts upon increase in temperature to compensate for respective contraction and expansion of the component.

Abstract: Variations in parameters of a waveguide system caused by an excitation of charge carriers of a specimen to be measured and positioned in a microwave field, give definite information on the material properties of the specimen without having to destroy, or even contact the specimen. Irradiation with a sharply focused photon or electron beam of a surface spot having a diameter of about 0.1 to 10.0 micrometers, and displacing of this light spot across the surface of the specimen, with the displacement increments of the specimen within the cross sectional area of a waveguide being of the order of magnitude of micrometers, surface structures such as ground boundaries, steps in stratified-lattice crystals, formation defects, destroyed surface areas, etc., can be detected in photosensitive semiconductor layers with a high resolution.

Abstract: A sewing machine housing includes a base to hold the machine's drive mechanism and a covering mounted on the base. To effect an easy alteration of the outer shape, the covering comprises a plurality of individual covering pieces with edge contours aligned with one another, the individual covering pieces being detachably connected to the base or to one another. In order to adapt to differently designed operating means in a given area of the base to be covered, a plurality of individual covering pieces are provided for that area with a plurality of different shapes with essentially the same edge contours and edge design.

Abstract: In the production of a desired musical waveform by combining harmonic components corresponding to respective harmonic orders, the cut-off harmonic order q.sub.c, each harmonic component value is controlled by selecting the level Ha and the slope of the Formant filter characteristic. The cut-off harmonic order q.sub.c, the level Ha and the slope value can each be varied over a predetermined range. These operations can be performed with a simple circuit arrangement involving a small number of memories. Therefore, the present invention greatly contributes to the reduction of the size and the cost of electronic musical instruments.

Abstract: A current leadthrough particularly for a refrigerator comprises an insulator with a plurality of electrically conductive spaced apart pins extending through the insulator. The insulator includes a disc-shaped base portion with a plurality of nub portions corresponding to the member of pins, the pins extending through the nub portions. The nub portions extending upwardly from the base portion and the base portion comprise a material having temperature stability which is insensitive to chemicals and has some elasticity.

Abstract: A method of cooling and dedusting coke after leaving the coke dry cooling system comprises directing the coke at a temperature of approximately 150.degree. to 200.degree. C. into an immersion tank which has a liquid temperature of approximately 100.degree. C., thereafter conveying the coke out of the immersion tank at a selected variable speed so as to free it of fine dust. The water content of the coke after leaving the immersion tank and after an adequate evaporation time is controlled by the speed of the conveyor which is located in the immersion tank and the water content is advantageously kept below 5%, preferably from 0 to 3%. The immersion tank comprises a closed housing overlying a box-shaped tank with a continuously revolving chain conveyor located so as to extend through the tank at its upper reach for conveying the coke into the tank and which has a lower return reach which is directed outside of the tank below the tank itself.

Abstract: The invention relates to a cylinder and piston unit with a cylinder tube closed at both its ends by cylinder end caps. An axially moving piston in the cylinder has a piston rod extending sealingly through at least one end cap. On the outer face of the tube there are four longitudinal means such as longitudinal ribs or round tie rods extending in the axial direction of the tube and equally spaced in the circumferential direction about the tube. Furthermore there is a mounting yoke for pivotally carrying the cylinder and piston unit and having at least two, and more especially four, generally diametrally opposite clamping jaws with trunnions on two of them. The mounting means furthermore constitutes an annular structure encircling the tube. At their ends the clamping jaws have gripping faces adapted to engage and grip the longitudinal ribs or rods on opposite sides thereof so that the tube is held firmly by clamping the jaws together.

Abstract: It is the object of the invention to provide a chemical substance which is effective, in particular, against insect-transmitted viruses, compared with conventional plant-virus disease preventive agents. This substance is produced from tissues of plants of the genus Mirabilis, and may be widely utilized as a basic protein with anti-plant-virus effects and as an active ingredient for plant-virus diseases preventive agents. Such preventive agents can eliminate difficulties in safety, and is effective because antiviral activity is developed systemically.

Abstract: The feature characterizing the method is that in an operation following the finishing of the track supporting structure, the mounting bodies are machined in a way such as to correct the structural inaccuracies caused by manufacturing tolerances of the prior art steel and concrete construction, to obtain an accurate mutual position of the equipment parts at the location of attachment. For this purpose, preferably, the mounting bodies are provided at the securing locations with bores and countersinks which are accurate in all the coordinates and correspond to the bolts or bores of the equipment parts, to finally mount these parts by means of bolts and spacer bushings. The bores and countersinks are formed by computer controlled drilling machines in a workshop where the support structures are held at a position which they will ultimately have in the field.

Abstract: The play set having a plurality of pieces having fixed shape, each of which is ideally made up of a number of variously disposed cubes, with at least a face in common, and at least a piece of variable shape and actually made up of a number of cubes variously matchable between them for taking up a number of shapes, always with a face in common; said pieces of fixed and variable shape being combinable between them to generate various spatial patterns.

Abstract: An off-road vehicle is equipped with an endless articulated steel band drive system including a drive wheel, a plurality of idle wheels and an endless belt extending around the drive wheel and the idle wheel. A back slider plate extends along the inner surface of the endless belt to urge the ground contact surface of the endless belt against the ground. The leading portion of the back plate rises upwardly at an angle of with respect to the ground. One of the idle wheels is rotatably mounted to the rear end of the back plate and the back plate is mounted to the vehicle frame by a leaf spring.

Abstract: Materials and systems substantially having photoactive properties are produced with a high quality output and without time losses in the fabrication process. To determine the quality of the photoactive material in situ, conductivity is induced in the material by exciting charge carriers through irradiation, and an electromagnetic field influenced thereby is measured, with the result of the measurement being evaluated by a computer with a corresponding control of actuating members such as valves and controllers. Optimum process parameters are thus found and used for the process.

Abstract: A folding device folds waistband ends into the waistband and the device moveable along with folding tools, clamping tools and engagement fingers in a way which allows the fingers to be inserted between layers of the waistband and moved the working area of a bar tacking machine, while clamping tools and folding tools are moved away from the finger so that they do no impede the inserting process. The control of the fingers and folding tools of the folding device is made more simple and economical by the use of control cams.

Abstract: A mixing and proportioning device for flowing media, which has feeding lines equipped with a pressure reducer for each line that leads through a mixing chamber and a mixed gas discharge pipe is constructed so that the mixing device closes independently of the supply pressure in the feeding lines, as the pressure differential between the mixing chamber and gas discharge chamber drops below the initially set value. For this purpose, the mixed gas discharge channel is connected to a gas discharge chamber, which is separated from the mixing chamber by a pressure-sensitive spring-mounted device, and this device has a connecting channel equipped with a closing arrangement valve disposed between the mixing chamber and the gas discharge chamber.

Abstract: A lubricant dispenser for a viscous lubricant such as grease, for a chuck body of a power chuck, comprises a container for containing a supply of the viscous lubricant. A delivery plunger, which is in the container and acts on the lubricant, is continually subjected to the pressure of a pressure medium. This forces lubricant from the container into a flexible line which is connected to a pressure intensifier mounted on the chuck body. The pressure intensifier contains a pressure piston which is movable under the influence of an intermittently operating pressure medium, and which carries a displacement piston which can be engaged against a receiving insert of the chuck body to open a valve and close the discharge of lubricant from the pressure intensifier into the chuck body.

Abstract: A direct current arc or resistance melting furnace includes a contact electrode produced as an exchangeable assembly outside the furnace and introduced into an opening provided in the bottom of the furnace tank. An annular gap between a refractory lining of the furnace tank and the contact electrode assembly is tamped.For exchanging the contact electrode assembly, it is detached from the lining with the aid of pressure elements (telescoping cylinders) arranged below the furnace tank and lifted upward far enough for the contact electrode to be pulled out of the furnace tank by the grip of a pulling device. Then a new contact electrode assembly is inserted.

Abstract: Mounting boards for supporting and connecting fluid power components are secured together with dovetail clips to make up arrays with a large number of terminals. There are grooves in end faces of the boards so as to define marginal lands which are engaged by the clips. The lands of adjacent boards form a complete dovetail structure to be gripped by a clip with a self-locking action. The contiguous faces of adjacent boards may have locating means such as pins and recesses. The boards may have spigots protruding from them for connection with piping. Venting ports are provided with muffler caps.