Abstract: The known process for transmitting two or more audio signals over a single transmission channel by eliminating alternate small segments from a first signal and filling the gaps with alternate small segments of a second signal and then filling in the gaps in the received signals with repeated segments, is found to be significantly improved with respect to comprehension or understandability, etc., if the audio signals are divided into a low frequency subband and one or more high frequency subbands and if the lowest frequency subband is transmitted substantially continuously while the higher frequency subbands are segmented and transmitted as before. Processes and apparatuses for splitting the audible signals into high and low frequency subbands and for treating the signals both on the sending and receiving sides to take advantage of the above discovery are disclosed.

Abstract: A separator for the particles of a particle-air stream is provided which is capable of varying the composition of the particles obtained from the stream by providing typical swirling-air type separators with a by-pass whereby a portion of the original particle-air stream can be passed by the separation zone without being acted on by the swirling air.

Abstract: A pressure sensitive resistance material and process for making the same is described which is of the type comprising an elastomeric matrix with conducting metal particles dispersed therein. Improved performance and improved ranges of conductivity between the no pressure and pressure ranges are obtained by coating the metallic conducting particles with semi-conducting material and further improved results are obtained when the semi-conducting material comprises a reaction product of an organic metal compound with an aryl peroxide of similar aryl compound. The material may be made available as a coating material or as a shaped product.

Abstract: A semiconductor component, preferably a thyristor, having emitter short-circuits in the cathode space. The emitter short-circuits are preferably arranged in a uniform fashion about the cathode space and, when formed of a material having <111> oriented crystals are arranged in ternary symmetry about the cathode or in multiples of three. In the case of material having <001> oriented crystals the emitter short-circuits are arranged in a quarternary symmetry or in multiples of four.

Abstract: The tool or device of the invention operates on an anchoring rod of the type which has spiral threads which threads only extend around a portion of the circumference thereof. Such an anchoring rod, when used to secure ceilings in mines, for example, has to be screwed into anchoring position and then have a nut screwed in the free end thereof to secure it against a steel plate applied against the wall of the ceiling. The device of the invention is in the form of a sleeve having an aperture at one end adapted to receive the nut to be applied and a means at the other end to connect to a torque applying device. Back of the nut receiving aperture, means are provided in the sleeve device which can, optionally, cause the rod, the end of which extends through the nut, to rotate with the sleeve, or to remain stationary while the nut is screwed thereon, whereby the insertion of the rods into the bore holes and the tightening of the nut thereon, can be accomplished rapidly with only one fitting of the tool thereon.

Abstract: In an induction energy transfer device comprising a static power conversion circuit for producing an alternating magnetic field of ultrasonic frequency of the type wherein the static power conversion circuit includes a parallel resonant circuit which comprises a coil which also couples power across an air gap, an improvement in efficiency and power transfer is obtained by including at least two such parallel resonant circuits in the power conversion circuit, one of which resonant circuits is tuned to the third harmonic of said fundamental frequency.

Abstract: A fibre network is disclosed for the optoelectronic transmission of data between and among a plurality of subscriber stations, each station having a transmitter and a receiver. A specific address code is allocated to each transmitter and its associated receiver, and the information content of the individual subscriber stations is sampled cyclically by a common addressing unit. The fibre network has n junction points, whereby n.gtoreq.1, and the individual fibre conductors lead from these junction points to the connected subscriber stations, in which the junction points contain passive coupling elements in the form of a solid, light-conducting core having opposing end faces. The fibres leading from the transmitters and from the addressing unit to a junction point are optically connected to one end face of a coupling element, and the outgoing fibres leading to the receivers are optically connected to the opposite end face of the coupling element.

Abstract: An apparatus which is suitable for automatic operation is provided for riveting bowed leaf-like springs to flexible bodies, e.g. for riveting shanks to innersoles. Two riveting devices are included in the apparatus for simultaneously riveting the two ends of the shank to the flexible body. This means for feeding the flexible body to riveting position and the means for feeding rivets to the riveting devices are more or less conventional. The shanks to be united to innersoles are fed one at a time, from a pair of magazines holding a stack of shanks at the ends, to a pair of guide bars containing matching grooves, pushed along the grooves by a pusher means, which shanks at the end of the grooves arrive at the riveting position. At the end of the grooves, the lower ends of the latter are in the form of leaf springs so that the shank to be united can be snapped out of the groove. The guide bars are mounted so as to be pivoted downwardly against the action of a spring.

Abstract: A rotary internal combustion engine which comprises a casing, a main shaft journalled in said casing, a rotor mounted on said main shaft for rotation therewith and having in its periphery alternate twisted and sloped recesses and walls, shafts mounted in said casing and extending normal to said main shaft and rotary partition discs mounted on said second-mentioned shafts on the opposite sides of said rotor and having twisted and sloped peripheral faces for sealing contact with said twisted and sloped recesses and twisted walls of the rotor in turn, said recesses and walls and discs cooperating with each other in defining compression chambers in which gaseous fuel is compressed, ignited and exploded.

Abstract: A rainbow phenomenon developing device comprising an arched structural framework defining an opening in which viewers walk, means for spraying fine water particles in the form of a mist mounted on said framework, colored transparent panels mounted on said framework in the same arrangement as that of the natural rainbow color distribution pattern, portions of said water particle spraying means extending through said panels and artificial light ray developing means mounted on said framework inwardly of and spaced from said transparent panels for illuminating the panels when energized whereby under weather conditions where the light rays of the sun are available, only the water particle spray means are operated to provide a mist atmosphere about the developing device for forming a rainbow phenomenon in cooperation with the light rays of the sun whereas under weather conditions where the light rays of the sun are not available, in addition to the operation of said water particle spray means, the artificial light

Abstract: Anchoring rods which have one end thereof secured in a bore hole of the earth or rock by surrounding cement are sometimes made more secure in the earth by one or more devices which surround different parts of the buried portion of the rod and have means for supplying additional cement at high pressure thereto to crack a portion of the surrounding cement and press additional cement into the earth adjacent the area of the device thereby forming a bulge in the anchoring cement. This disclosure relates to a device of this type which, however, has an elongated body of elastic material with a longitudinal slit or opening adapted to surround the anchoring rod and be retained thereon at the desired site and which body contains an opening or channel spaced from the rod-surrounding opening or slot substantially parallel to the latter which defines a distribution channel and has an orifice therein which is ordinarily covered by the body of the device.

Abstract: There is disclosed apparatus for the sectional cantilever construction of bridge girder systems of reinforced or prestressed concrete having a superstructure comprising a closed box cross-section and superimposed laterally overhanging bridge decking, said apparatus comprising travel devices for abutting against an already finished part of the bridge superstructure at whose position fixed support members, e.g.

Abstract: The disclosure relates to an anchoring device adapted to hold one end of a to-be-stressed linear member within the bore hole of an earth formation. The anchor device has a tubular body surrounding and retaining a section of the linear member and has a compression channel extending along the circumferential portion of the body. The compression channel being open to the outside of the tubular body through a substantial part of its intermediate length to form a distribution channel. Means are provided for feeding hardenable material under pressure to the regions outside the device to compress the earth surrounding the bore hole. The body is covered with a sleeve of elastic material encompassing the body to normally cover the open part of the distribution channel.

Abstract: The tank ship is made of monolithic reinforced concrete and is formed with two symmetrical, longitudinal chambers for tanks, and an intermediate space for the operating mechanisms thereof. The massive reinforced concrete slabs which form the ship are reinforced partly by prestressed steel tendons and partly by mild (non-stressed) steel rods. The prestressed tendons running lengthwise of the ship are unspliced. The transverse bulkheads forming the ends of the tanks are curved in two directions, e.g. in the form of sections of hemispheres. Insulation is provided on the interior surface of the tank chambers and on both sides of the bulkheads.

Abstract: Method and apparatus for enhancing the secret (confidential) transmission of voice (speech) type signals. The voice signals are encoded at a transmitter facility. Filling signals are inserted into breaks and interruptions normally encountered between words and/or phrases. Such breaks and interruptions may be either partially or completely filled with the filling signals which preferably correspond as close as is practical to the characteristic of either coded or uncoded voice signals with regard to time variation and spectral energy distribution and the filling signals may be derived from voice signals of either the coded or uncoded type which are at least temporarily stored by the transmitter facility. The resultant signal having either shortened or completely eliminated breaks and interruptions is then encoded and transmitted to a remote location. Alternatively, the voice signals may be intially encoded before the insertion of filling signals into the breaks and/or interruptions.

Abstract: A plural circuit filter for electromagnetic waves, especially microwaves, of the type which comprises dielectric resonators, is provided wherein dielectric resonator disks or washers are positioned in a tubular metallic housing acting as a shield, the resonator disks being positioned centrally of the housing tube with the axes of the disks extending perpendicularly to the axis of the tube and the separate resonator disks being separated in the housing by apertured partitions which partly determine the coupling coefficient between adjacent circuits.

Abstract: Method and apparatus are disclosed whereby messages are encoded by message element exchangers which utilize a delay device for transposing selected pairs of message elements so that the first element of the pair undergoes a delay 2T and the remaining message element of the pair experiences no delay. Message elements not treated in pairs undergo a delay T. The delay T is an integral multiple of the duration of a message element (said elements preferably being of equal length T.sub.0). Transmitted messages which have undergone selective transposition are decoded in a similar fashion, whereby the undelayed message element of a pair undergoes a delay 2T, the remaining element of the pair undergoes no delay and messages elements not treated in pairs undergo a delay T.Exchangers of dissimilar delay periods may be connected in cascade to enhance the number of possible delay displacements which message elements may undergo.