Abstract: A low frequency submarine communication system which utilizes the submarine ody as part of the antenna. The antenna is coiled around the submarine hull and utilizes the hull as the core for low frequency (below 1000 Hz) communication. The system allows communication with other vehicles below, on, or above the surface without impeding submarine operation (speed or depth) and the system greatly decreases chances of unwanted detection of the submarine.

Abstract: Apparatus for air navigation to a point of known location which is separated from a VOR beacon of known location. The apparatus comprises storage means for storing signals representative of, respectively, the known locations of said point and said VOR, an estimated ground speed, an estimated range-to-go to said point, and an estimated course to said point, means for receiving from a VOR signal receiver/VOR bearing generator a signal representative of the current bearing of said VOR beacon, a bearing change generator for generating a signal that is representative of the change in the VOR bearing, a course estimator for generating a signal representative of an updated course heading, a range-to-point estimator for generating a signal representative of the range-to-point, and control means for controlling the bearing sampling and for activating the course estimator at predetermined intervals.

Abstract: An improved material for an ultrasonic transducer assembly having improved noise suppression characteristics comprising an ultrasonic transducer having a plurality of surfaces, a housing for receiving said transducer whereby one surface of said transducer is free to transmit and receive ultrasonic waves, and a material positioned about said transducer and between said transducer and the environment or housing for attenuating ultrasonic energy, said material comprising a heavily loaded resin based on an unfilled low viscosity potting gel and a filler selected from the group consisting of heavy oxides, metal powders, and density lowering fillers. In specific embodiments lead oxide, tungsten powder, and glass microspheres have been used as the filler in a silicone or flexible epoxy.

Abstract: A radiometer of the switched type has an R.F. switch connecting a detector selectively either to an antenna whose temperature (in terms of noise energy) is to be determined, or to a reference temperature, i.e. a resistive termination. The detector output is passed through an amplifier whose gain is switched between positive and negative values (for example +1 and -1) synchronously with the R.F. switch. The output of the switched gain amplifier is integrated to produce a rising voltage when the gain is positive and a falling one when it is negative. When it is positive the detector is connected to the antenna. By means of a zero crossing detector, a counter is started when this voltage crosses zero. After a fixed period, the R.F. switch and switched gain amplifier are reversed by the counter to cause the voltage to fall in accordance with the temperature of the resistive termination.

Abstract: Apparatus is provided to detect a discontinuity indicative of a hole in the bore wall of an axially extending tubular member. It comprises:(a) a carrier to be traveled axially lengthwise in the bore of the tubular member,(b) an acoustical wave transmitter located on the carrier to transmit acoustical waves for travel toward the bore wall and for reflection therefrom,(c) an acoustical wave detector at least partially located on the carrier to receive acoustical waves reflected from the bore wall and to detect the presence or absence of such reflected waves, and(d) a control for providing an indication of such discontinuity, and for controlling the transmission to the detector of the reflected acoustical waves, and characterized in that the detector is controllably exposed to reception of a sequential succession of reflected acoustical waves corresponding to a sequential succession of bore wall portions from which the waves are reflected.

Abstract: A convergence control system suited for use with high resolution color display monitors or color television receivers. The system includes both primary and secondary convergence controls having minimal interaction between them. An exemplified convergence control system comprises circuitry designed to develop output signal waveforms for implementing the following expression: ##EQU1## where X is a horizontal deflection-related signal input to the system, K is a static control for adjusting convergence at the center of the CRT screen, K3 and K4 are left and right side convergence controls, and K1 and K2 are secondary controls for correcting residual misconvergence--i.e., misconvergence at areas of the screen intermediate the areas converged using the K, K3 and K4 controls. A similar system is provided for providing vertical deflection-related convergence waveforms.

Abstract: A seismic streamer section includes a flexible tube with bulkheads at intervals therealong, end means to make electrical and mechanical connections with adjacent sections, tension lines extending from one end means to the other through the bulkheads, hydrophones in the tube between the bulkheads, an electric bundle including through conductors extending from one end means to the other through the bulkheads to various ones of the hydrophone. Each hydrophone comprises a drum shaped case with dished ends and convex sides providing standoff from the bundle and lines for piezoelectric wafers supported inside the ends. A cylindrical metal ring forms the side of the case. Stainless steel cups disposed with their bottoms adjacent and having their rims welded to the rims of the ring form the ends of the case. The piezoelectric wafers are conductively secured one each to the inner surfaces of flexible diaphragms forming the bottoms of the cups.

Abstract: A color television receiver includes a color picture tube having three electron guns including cathodes and heaters therefor, respectively, and an automatic cutoff adjusting circuit for adding a reference voltage signal substantially at a black level to a luminance signal during an interval beginning substantially at the end of a vertical blanking period, and for detecting cathode currents flowing toward the cathodes during the above-described interval to control cathode voltages for the cathodes for keeping the cathode currents at a predetermined level by way of feedback of voltages proportional to the cathode currents. There is provided a circuit for applying a positive voltage to each of the heaters during the above-described interval to reduce a potential difference between the heater and corresponding one of the cathodes to thereby lower a leakage current flowing between the cathode and the heater.

Abstract: A marine seismic cable comprising a cable core, a housing adapted for holding an acoustic energy transducer, and a body of elastic material positioned between the cable core and the housing.

Abstract: An automatic S correction circuit for a resonant scan deflection circuit comprises a plurality of S-shaping capacitors. The peak voltage and the peak-to-peak voltage across the S capacitors are detected, and the number of effective capacitors is varied to maintain the peak voltage and the peak-to-peak voltage in a predetermined relationship.

Abstract: A circuit for pulse heating a line cathode also protects the cathode from voltage and current surges. An adjustable voltage regulator provides a regulated voltage to a pulse generation circuit. The voltage regulator has a control input which is used to control the regulator output. The voltage on the control electrode is controlled by a control circuit which is actuated by a logic circuit. The logic circuit and the pulse generator are responsive to the horizontal synchronization pulses of the display device containing the line cathode.