Abstract: This autobalance hybrid circuit is used to connect a 2-wire duplex telephone line to a 4-wire line which has separate receive and transmit pairs. The impedance of a balancing network automatically is adjusted to equal the impedance of the 2-wire line, thereby maximizing echo return loss. "Howling" and "singing" are eliminated, regardless of changes in the 2-wire line impedance. Balancing is achieved by comparing the absolute values of the receive line audio voltage components appearing across two coupling transformers, one associated with the 2-wire line and the other with the balancing network. A control signal, indicative of the difference between these components, alters the balancing network impedance until equal voltages are achieved. In this condition, the receive signal cancels out as a common mode in the output circuit, so that none of the receive line audio is returned to the transmit pair.

Abstract: A memory tone dialer for touch-tone telephone lines. The tone dialer comprises a touch tone keyboard, a means for generating tones which correspond to the keys of the keyboard, and a programmable means for remembering at least two sequences of numbers which may be telephone numbers or sets of numbers. In the preferred embodiment, the tones generated by the tone dialer may be coupled to a telephone system by a speaker or a jack.

Abstract: A differential light scattering photometer is disclosed for testing samples of bacteria in suspension. A plurality of cuvettes containing the samples are placed in a cuvette holder or carousel which rotatably places each cuvette in position to interrupt a laser beam. A detector rotates in an arc about each sample to produce output signals representing the scattered light intensity as a function of angular location, relative to the incident laser beam, about the sample. A control differential scattering pattern is produced and compared with test differential scattering patterns derived from test samples having added antibiotics. The patterns are compared by data processing to produce an output punched card indicative of bacterial sensitivity to each antibiotic. The data processor is responsive, through pattern comparison, to various responses of the bacteria, i.e., whether the antibiotic is bactericidal, bacteriostatic or the bacteria actually metabolize the antibiotic.

Abstract: A radio beacon for a nautical emergency rescue system includes a flotation housing containing an antenna in an upper portion, a ground plane and a transmitter in a central portion, and batteries in a lower portion. When placed in the water, the lower section is submerged and the central section is at surface level, enabling contact between the ground plane and the water via conductors that pass through the housing. The upper portion projects above the water to permit efficient radiation from the antenna, which consists of a vertical rod and a coaxial cylindrical can that is open at the bottom end. The upper end of the rod is attached to the center of the can closed end. The radio transmitter is frequency modulated in a distinctive pattern, and operates with a duty cycle that permits detection and direction finding of multiple such beacons.

Abstract: A flame jet tool for drilling a hole in the ground at great depths is disclosed. The tool comprises a flame jet lance having a drill bit and an associated fuel system. The lance is disposed in a guide sheath such that the lance may be raised and lowered therefrom. The tool may also include means for capturing debris. In operating the flame jet tool of the present invention, the guide sheath is lowered into a preexisting well hole a specific distance. The guide sheath is fixed to the sides of the hole and the flame jet lance is lowered from the guide sheath. At a predetermined point, the drill bit is ignited and caused to rotate thus increasing the depth of the hole. By the use of the flame jet tool of the present invention, holes of significant depth can be increased and materials of extraordinary hardness can be pierced.

Abstract: An electronic musical instrument is of a type wherein musical tone waveforms are stored in a memory as their sampled amplitudes and sequentially and repetitively read out to constitute tone waveforms. A key depression brings forth frequency information in a digital representation. The frequency information is accumulated to make an address signal for reading out the waveform memory. When a depressed key is moved laterally, a touch detection circuit produces an analog detection signal representing the amount of displacement of the key. In the meanwhile, a clock pulse is counted by an up-down counter and the counting output is converted by a D-A converter to an analog signal to obtain a triangular wave function signal. When the analog detection signal coincides, in amplitude, with the triangular wave function signal, the digital signal from the up-down counter is sampled and held by a sample and hold circuit. Thus a digital signal representing the key displacement is obtained.

Abstract: A recirculating exhaust hood for a dishwasher may be comprised of an exhaust duct, a positive pressure plenum, a negative pressure plenum, and a fan for circulating air from the communicating dishwashing cavity through the positive and negative pressure plenums, and the exhaust duct. Air drawn through the intake of the fan is circulated through the positive pressure plenum to a supply slot. High velocity air exiting from the supply slot to a contiguous intake port of the negative pressure plenum creates a high velocity stream of air which by entrainment or by Venturi effect draws warm moisture laden air from the dishwashing cavity into the negative pressure plenum. The entrained moist warm air is then recirculated to the positive pressure plenum by means of the fan. A portion of the output of the fan is directed to an exhaust duct and removed from the dishwashing system.

Abstract: A new building structural system is described that employs unique elements to interconnect standard structural members in a simple, economical and effective manner. These unique interconnecting elements interconnct a girder and a span member of a building structure, the span member being either a joist or a truss. They consists of two interlocking pieces or elements, one connected to the end of the span member and the other to the side face of the girder member. These unique elements incorporate shaped involutions, webs and reinforcing members that interlock as one element seats down upon the other to interconnect the members in a rugged, rigid fashion. The resulting building structure provides both a flexibility of design and a simplicity of assembly that is remarkable.

Abstract: The following specification discloses an encatheter adapted for biaxial flow for receipt of a syringe at one end with a main axial passage interconnecting a plastic or teflon insertion conduit at the other end adapted for placement in a blood vessel with a needle. The hub in its main axial passage, has a flapper or one way control valve, that can be made of an elastomeric material. The valve is adapted for receiving the needle therethrough for simultaneous insertion of the insertion conduit and the needle within the interior of a blood vessel. The insertion conduit remains within the blood vessel after the needle is removed, at which time a second interior tube is implaced within the insertion conduit through the main axial passage and valve to provide coaxial orientation between the two. Th conduit and tube each respectively connect to a biaxial flow device for branched flow through the device to two rubber tubes.

Abstract: This hydraulic engine utilizes two sets of hydraulic cylinders connected to a shaft so as to be alternately pressurized as the shaft is reciprocally driven by a pair of conventional internal combustion chambers. The outlets of all hydraulic cylinders are connected to a common output line via valves. During each power stroke certain of the hydraulic cylinders being pressurized are selectively disconnected (depressurized) from the output line. This effectively decreases the load on the driving chamber, and insures a relatively constant, high pressure hydraulic fluid output level despite changes in supplied force during each power stroke. The selective cylinder disconnection may be implemented programmatically in response to changes in engine parameters such as combustion pressure. The engine also includes a pump for supplying input hydraulic fluid to each set of cylinders while that set is not being compressed. The input fluid force is additive to the power supplied by the operative combustion chamber.

Abstract: A nozzle insert for a turbine and a turbine embodying a plurality of such nozzles. The nozzles are removably mounted in the turbine to enable them to be readily replaced in the event of damage. Each nozzle has a working fluid passageway extending therethrough and forming a rectangular exit in a turbine blade-confronting surface. The passageway includes an arcuate or otherwise curved section adjacent an inlet of the passageway and a rectilinear section adjacent the exit of the passageway.

Abstract: The mat cutting machine includes a base to which is attached, preferably by spring-loaded posts, a trapezoidial-shaped guide bar with a first face oriented to the base at an acute angle, the angle of the beveled cut desired to be made in a mat, and a second face at right angles to this first face. An L-shaped carriage including a cutting blade may be placed on the guide bar by, first, placing one of its edges against the back surface of the guide bar while bringing a portion of the front surface to bear on the front surface of the guide bar, then sliding the remaining portion of the carriage down upon the guide bar while keeping the inner surface of the carriage on the front surface of the guide bar. This action causes the cutting blade to enter a mat at the proper angle. Preferably the carriage and guide bar are made of wood.

Abstract: The analogue filter system is constituted by first and second analogue filters having similar characteristics, a delay device connected between the first and second analogue filters and controlled by a timing circuit for storing the output of the first analogue filter and for producing an output with its time axis inverted, and a device for restoring the time axis of the output from the delay device.

Abstract: A filter apparatus for aquariums consisting of two separable units. Within a filter unit is located the water filtering means and a pump for circulating the water from the aquarium through the filter means and back to the aquarium. Mounted upon a power unit is a motor having an output shaft which at one end is provided with a magnet. The power unit and filter unit are both hung from the rim of a wall of the aquarium by means of interlocking lip structures. The units are constructed such that the filter unit is seated in a "nesting" fashion upon the power unit, thus the power unit and filter unit are positioned in close proximity to one another and maintained in proper alignment such that the magnetic field of the magnet on the motor shaft magnetically influences a flywheel of the water pump and causes the latter to pump water when the motor is energized.

Abstract: A process for synthesizing single crystalline beryl out of a molten salt is disclosed. The process comprises the steps of providing at least one flux to which is added the component oxides of beryl and optionally a colorant. The mixture thus obtained is heated at a temperature higher than the melting point of the flux to thereby form a molten salt. After the formation of the molten salt, the salt is cooled below the temperature sphere of beryl formation and is thereafter reheatd and again melted. At this point beryl crystals are added to the molten salt which thereby form single crystalline beryl from the molten salt. By the use of the process of the present invention, superior quality single crystalline beryl is produced economically and at a high yield rate.

Abstract: At least one cylinder driven at a constant speed is contained in a casing and a dial plate mounted on the casing is provided with a window extending in the direction of the cylinder. The upper edge of the window is marked with digits. The outer periphery of the cylinder is divided into two sections by a line inclined a definite angle with respect to the axis of the cylinder, and the two areas are coloured by different colours. The inclined line cooperates with the digits to display time. When two or three cylinders are used it is possible to display hours, minutes and seconds.

Abstract: An n channel MOSFET transistor which includes doping of previously formed source and drain elements with a heavy diffusion of phosphorous or arsenic creating n++ regions in the source and drain. The extra diffusion step is preferably accomplished just prior to contact metalization.

Abstract: In a mortar compounding apparatus wherein water, cement, aggregate and sand are admitted into a mixing tank at a predetermined ratio and admixed to form mortar, there is provided a control apparatus including detection blades rotated by a constant torque motor via a spring in the mixing tank or a detection tank connected thereto. The load imposed on the detection blades by the mortar is detected by a potentiometer for controlling the amount of water or solid constituents admitted into the mixing tank.

Abstract: In this blind rivet, the sleeve is counterbored from the rear end, and has interior axial splines forward of the counterbore. The bulb-forming lugs project laterally from a shoulder portion of the mandrel that has a diameter sufficiently great to collapse the sleeve splines during rivet installation. Between the bulb-forming lugs and the mandrel blind end are a set of annular flutes in the mandrel. During rivet installation these flutes urge radial expansion of the sleeve counterbore region to assist hole filling. The sleeve may include a lock-collar-guiding counterbore having an annular convex region providing a locking collar entry resistance surface effective during the initial phase of rivet installation.

Abstract: A semiconductor memory employs a variety of circuit elements which are used to manipulate the digital information stored within the rows and columns of the memory array. The circuit elements must be manipulated in an ordered sequence with proper relative timing to permit decoding of various addresses and other circuit commands and enabling of various ones of the circuit elements. The plurality of timing signals are generated within the memory by a corresponding plurality of timing generators. Accurate timing and sequencing is obtained by utilizing the output of one timing generator to trigger or initiate the generation of a signal in another generator followed by either proper conditioning upon an input signal, such as an address, or by a predetermined delay designed into the timing generator itself.