Abstract: A method and a device for monitoring hydro turbine plants. The device comprises one or several hydro turbines, at least one of them having adjustable vanes. For optimum utilization of the available amount of water, the vane angles in the turbine are automatically adjustable in dependence on the level in the water dam, which level is measured at predetermined intervals. When the plant comprises several turbines, the level indicator is also used for start and stop.

Abstract: A trunnion type ball valve arranged so that biasing means is not needed to establish a seal between the valve seats and the ball when the valve is in the closed position. There is no load on the valve seats in the open position and a sufficient load in the closed position to effect a fluid seal in the closed position. The valve seats are movably mounted in the valve body so that they are displaced during opening and closing movement, but center themselves in the open and closed positions.

Abstract: A power station boiler condensate water monitor employs a light-scatter cell for the detection of oil and/or particulates in the water. In order to determine background scatter levels, provision is made to alternatively pass clean water through the cell (FLUSH). The offset voltages obtained from the detector outputs when clean water is employed are compensated for differences in temperature between the boiler condensate water and the clean water before substraction from the detector outputs when boiler condensate water is employed. The monitor is capable of detecting oil levels of less than 2 parts per million.

Abstract: This invention comprises in combination a body of piezoelectric material, means for propagating an acoustic wave in a first mode, means for converting a portion of the acoustic wave energy into an acoustic wave in a second mode, a resonant structure in which the acoustic wave energy in the second mode is resonant, means for reconverting the acoustic wave energy in the second mode into surface acoustic wave energy in the first mode, means for providing a predetermined phase shift of the reconverted acoustic wave energy relative to the original propagated acoustic wave energy, and means for recovering the combined acoustic wave energy of the original and phase shift reconverted acoustic wave energies as an electric output signal.

Abstract: In a radio or television receiver containing an automatic station finder with a digital counter, a clock generator, and a digital-to-analog converter forming the tuning voltage for the varactors, a recall memory consisting of two series-connected parallel memories is connected in parallel with the digital counter. At a stop signal from the automatic station finder the first parallel memory records the instantaneous count of the digital counter; at an automatic-station-finding start signal the second parallel memory, to which the parallel input of the digital counter is connected, records the contents of the first parallel memory.

Abstract: There is disclosed a brake shoe including a backing plate having a recess therein to receive the friction pad. Each of the radially inner and outer vertical walls of the recess with respect to the brake disc axis have a different predetermined configuration to retain the friction pad in the recess and to ensure that the entire backing plate receives the braking stresses rather than just a retaining arrangement employed to assist in retaining the friction pad in the recess.

Abstract: Fiber optic ribbons are attached to the output facets of laser dice which are positioned in thin slotted anodised aluminum plates between indium coated copper plates. A plurality of such plates provide a stack which is compression bonded with the opposite laser faces extending into the adjoining indium coatings. The sides are lapped and clamped to a heat sink.

Abstract: A method for forming optical fibers reduces losses of germania dopant due to evaporation during chemical vapor deposition. After deposition of a high purity silica layer on the inner surface of a hollow silica tube, the tube is closed at one end and loaded with a small amount of crystalline germanium compound, such as germanium iodide. The other end is then also sealed and the tube is heated to vaporize the GeI.sub.4 and deposit a coating of germanium. This process may be repeated to build up the Ge layer. The tube is then broken open at both ends and the iodine vapor removed. The germanium layer is oxidized and heated to diffuse germania into the silica layer to provide a doped high index of refraction core layer on a lower index cladding layer. The tube and layers are then collapsed to form a preform which is later drawn into the optical fiber.

Abstract: A floating-caliper disc brake includes a stationary brake carrier and a stop thereon to limit the maximum travel of the floating caliper to a given distance. This reduces the space required to mount the disc brake, and the driver is able to notice wear of the brake pads.

Abstract: The products to be wrapped are moved from an input conveyor belt onto a vibrating infeed and proceed through a timing wheel which predeterminedly spaces the products. The products are dropped into a receiving yoke, and a sheet of wrapping paper is positioned such that a reciprocating plunger moves the paper and product through a forming cone and into a wrapping head which folds and closes the paper on the product.

Abstract: The reeling system is contained within a buoy towed by a submerged submarine. The reeling system includes a pressure sealed housing, a cable reel disposed for rotation within the housing and a buoyant cable antenna disposed in an ejecting and retracting relationship with the reel. One end of the cable antenna extends from the housing to the exterior of the buoy. A cylinder-piston arrangement having a sea water inlet and a connection to the housing is responsive to the pressure of the sea water at the inlet to control air pressure in the housing to provide a pressure difference between the air pressure in the housing and the pressure of the sea water on the one end of the cable antenna exterior of the buoy for ejection and retraction of the cable antenna from and into the buoy.

Abstract: An FM receiver has a first pair of signal mixers for receiving an RF signal and a local oscillator for providing a signal to said mixers at a frequency near the center frequency of the received signal. A phase shifter shifts the phase of the local oscillator signal to one mixer by 90.degree.. The outputs of the first pair of mixers are connected to low pass filters having cut-off frequencies equal to approximately one-half the bandwidth of the received signals. A second pair of signal mixers receive the filtered signals and an oscillator signal at a frequency equal to at least twice the cut-off frequency of the low pass filters. The oscillator signal to one of the mixers is phase shifted 90.degree.. The outputs of said second pair of mixers are added together, amplified, limited and thereafter demodulated to provide an audio signal. Automatic frequency control is also provided for the local oscillator.

Abstract: A glass casing for a capacitor includes a lead wire at one closed end which is filled with aluminum powder. A hollow porous tubule is inserted into the powder which is sintered, with the glass mold withstanding the sintering. The mold and sintered body are immersed in an electrolyte with the lead wire connected as the anode to form the dielectric oxide layer. The oxide layer forming solution is removed and a manganizing solution penetrates through the tubule and sintered body. Another lead is inserted through the tubule and joined to the manganese layer. Resin may be poured into the open mold and the glass fused at the open end.

Abstract: This invention relates to a circuit for switching a voltage controlled RF oscillator between two preset variable frequencies and simultaneously imposing frequency modulation about the selected center frequency. A frequency modulation signal is fed to a stabilized amplifier chain consisting of a low level amplifier, a high level amplifier and a feedback network. A switching network allows the output of the feedback network to be changed as a function of the frequency selection input. An isolated input is provided for the injection of frequency modulation.

Abstract: A circuit is provided to produce an output pulse for each analog input pulse whose amplitude and width fall within specified limits. A first amplitude comparator produces a first signal when the amplitude of one of the input pulses exceeds a first reference amplitude and a second amplitude comparator produces a second signal when the width of the one of the input pulses has an amplitude exceeding a second reference amplitude different than the first reference amplitude. Digital circuitry is coupled to the second amplitude comparator to convert the second signal into a binary count, to produce a third signal when the count is greater then a minimum pulse width reference count and to produce a fourth signal when the count is less than a maximum pulse width reference count. A logic gate and pulse generator is coupled to the first amplitude comparator and the digital circuitry responsive to the simultaneous presence of the first, third and fourth signals to produce the circuit output pulse.

Abstract: A transmit phase locked loop receives data to be transmitted having a bit rate equal to a first given one of a predetermined number of different bit rates. A diphase demodulator responds to the transmit phase locked loop and the data to be transmitted to provide output data for transmission. A receive write timing signal and a receive read timing signal is coupled to a receive phase locked loop to compare the phase relation of the two timing signals. A diphase modulator responds to received data having a bit rate equal to a second given one of the predetermined number of different bit rates and a clock signal provided by the receive phase locked loop to provide output data for utilization. The first given one of different bit rates and the second given one of different bit rates may have equal or different bit rates.

Abstract: A multi-terminal arrestor holder and connector module provides electrical connection between telephone lines and telephone repeaters by means of a single body module which houses one three-electrode gas tube lightning protector for each pair of telephone lines. Lightning protection is accomplished by ionization occurring between either of two electrodes and a grounded intermediate electrode. Replacement of the arrestors and repeaters is conveniently provided by the spring clip mounting arrangement integrally formed within the arrestor module so that damaged arrestors can be readily removed without interrupting telephone service.

Abstract: A control circuit is disclosed to automatically tune an antenna coupler to provide an output signal having a selected one of different operating frequencies. The antenna coupler includes a frequency band selecting switch and a plurality of tuning elements certain or which are available to provide the desired output signal. The switch is controlled by a first relay controlled motor and the variable tuning elements are controlled by a second relay controlled motor. First logic circuitry is coupled to the first and second motors to control the tuning of the antenna coupler sequentially through a preposition step, a tuning step and an antenna coupler ready step. An amplitude comparator having a given capture range has its input coupled to the antenna coupler and second logic circuitry is coupled to the amplitude comparator, the first logic circuitry and the second motor.

Abstract: A magnetically actuated switching device using reversibly magnetizable armatures treated by a selective annealing process. The annealing process changes the homogeneous coercive magnetic properties of the armatures so that the highest coercive force is caused to occur in the region of the armature which is subjected to magnetizing forces from an energizing coil, and the region of the armature existing outside the magnetizing field is annealed in a manner to lower the coercive force of the armature. Selectively annealing the armature to provide high coercive force in the vicinity of the magnetizing coil reduces the amount of magnetizing force necessary to be supplied by the coil for switching the armature from a closed to an open contact position.