Abstract: An electronic locator for tracing the course of a metallic discharge line which is disposed underground. A reel means stores a length of flexible hollow cable and is operable when rotated to advance the free end of the cable into the metallic discharge line. Conductors extending through the cable provide for electrically connecting an audio frequency signal generator located on the reel means to a transmitter antenna attached to the free end of the cable. A directional receiver means determines the location of the discharge line by detecting the high strength, varying frequency signals generated by the audio frequency signal generator and radiated by the transmitter antenna through the walls of the metallic discharge line.

Abstract: A method of and an apparatus for controlling the amount of the electron beam in a photoconduction type image pickup tube in which the signal corresponding to the return beam from the photoelectric conversion plane is detected, the detected signal is compared with a reference signal and amplified, and the resulting signal is applied to the scanning electron beam current control electrode. By appropriately determining a plurality of circuit constants the return beam can be maintained approximately at a constant value independently of the amount of light incident upon the photoelectric conversion plane.

Abstract: An intermediate frequency interferometric technique and apparatus for the measurement of angles, for example the measurement of the elevation and azimuth bearing angles between an aircraft installed transmitter and a ground based receiver, are disclosed. Carrier and sideband signals emitted by a mobile transmitter are received by at least a pair of fixed position antennas, spaced at a nominal distance equivalent to the wavelength of the frequency separation between the transmitted carrier and its associated sideband, and the angle related path length difference between the transmitter and the spaced receiving antennas is measured in wavelengths at the carrier modulation frequency.

Abstract: A highly directional acoustic source for use in a well logging system wherein a fluid-filled tube is provided with a transducer at one end and an acoustic reflector at the other end to reflect the acoustic beam into the formation. The transducer is excited at two frequencies whose difference is the desired frequency and the tube is made sufficiently long to produce parametric generation of the difference frequency.

Abstract: An apparatus for focusing ultrasonic waves in a focal line by an ultrasonic optical system having at least one rotation-symmetrical, non-spherical acoustical reflection surface which together with an ultrasonic transducer element transmits an at least partially convergent ultrasonic field having an annular cross-section.

Abstract: Electron discharge device including a channel plate electron multiplier provided on its output face with a conducting layer of which substantially annular endspoiling segments extend a distance into the channels. The ends of the endspoiling segments are slanted in the same direction, and to at least the same degree of magnitude, as are the channels themselves with respect to the output face.

Abstract: A surface based direction finder for determining the direction of radiations from a remote station (aircraft for example), using a plural element linear or circular receiving antenna array. The arriving energy phases are measured in at least one element group with two element pairs, (for example) the elements of each pair being equally spaced and aligned so that a line joining elements of even ordinal number is parallel to the line joining the elements with odd ordinal numbers. The amplitudes (m1, m2, m3 and m4) and the phases (.alpha.1, .alpha.2) of the rf signal picked up by each element are measured separately and the phase .beta. of the desired wave is determined by computer solution of the typical equation derived from the law of consines;m1.sup.2 + m2.sup.2 -2m1 m2 cos (.alpha.1 - .beta.)= m3.sup.2 + m4.sup.2 - 2m3m4 cos (.alpha.2- .beta.).Other configurations employing three elements in line and elements in a circle are also described and the corresponding cosine law equations given.

Abstract: An acoustical switch is actuated from a remote location by a sound generator such as an ultrasonic whistle. The switch includes a special tuned signal receiver coupled with an amplifier having a frequency selective feedback network. The output of the amplifier is an a.c. signal which is applied to a bistable circuit which, in one state, energizes a relay to turn on an appliance connected to the switch and, in its other state, turns the appliance off.

Abstract: This is a method, and apparatus for practicing such method, wherein motion of an object may be detected remotely and relative speed of the object may be detected wherein a transmitter having an antenna is attached to the object and changes in the collector current, due to changes in the impedance of the antenna, resulting from changing conditions of the object such as motion and speed, are detected, remotely, so as to indicate conditions of rest, motion, and speed of the object and wherein the change of the impedance, and collector current resulting therefrom, are functions of the motion and/or speed of the object.

Abstract: A supply voltage for signal processing circuits of a television signal processing system is developed in the secondary circuit of a transformer. AC power is coupled to the primary of the transformer through a circuit breaker whose operation is controlled in response to the supply voltage. The circuit breaker includes a normally nonconductive (i.e., high impedance) path which is rendered conductive (i.e., low impedance) with the development of the appropriate supply voltage and rendered nonconductive when the supply voltage falls below a predetermined threshold. A normally conductive (i.e., low impedance) path is coupled across the normally nonconductive path and is rendered nonconductive (i.e., high impedance) as current flows through it. The circuit breaker is particularly useful when the transformer is of the ferroresonant type, since the primary current of a ferroresonant transformer remains substantially constant with changes in the secondary current even under fault conditions.

Abstract: A system for detecting, monitoring the movements of, and controlling the travel of aircraft and other vehicles on an airport surface. A series of small low-powered radar transmit-receive devices, each having a limited range, is disposed essentially in a line along alternate and opposite sides of a runway, ramp or taxiway. Control pulses at a system PRF travelling down the inter-connecting cables serve to cause the individual radars to "blink" in sequence in accordance with the inherent delay in the inter-connecting cable. Frequency separation is used to prevent false indications due to transmit-receive inter-action among the individual miniature radars. The system is adapted to data presentation in accordance with standard radar display techniques, or alternatively, a display is provided on a synthesized map of the airport. A pulse delay discriminator arrangement provides for discrete lateral position control.

Abstract: A deflection circuit for a television receiver is made more suitable for single chip integrated circuit construction by utilizing a switching means connected between a part of the transistor amplifier used to amplify a saw-tooth wave form and a power source. This permits a part of the energy stored in the deflection coil to be released through the amplifier during retrace intervals.

Abstract: In the ultrasonic apparatus being so constructed as to be capable of directing the oscillation of ultrasonic waves to the inner part of a container and the like, an ultrasonic apparatus characterized by the provision of an ultrasonic wave transfer preventive member to ensure the prevention of transfer of ultrasonic waves to unintended matters other than the object matter.

Abstract: Position detecting device for use with omega navigating apparatus which includes a receiver for receiving two omega signals from different stations, a synchronous generator for producing first and second signals synchronized with the omega signals and frequency dividing the synchronized signals by a common divisor to produce first and second frequency-divided waves, frequency dividing means for dividing the phase difference between the frequency-divided waves by the period of the omega signals to produce an integral quotient which constitutes a lane number while the remainder represents the phase difference between the first and second omega signals.

Abstract: An analyzer device for VOR navigational receivers utilizes a first receiver section in which the reference phase, transmitted in the form of a frequency modulation, is available in demodulated form as reference signal, and a second receiver section in which the rotational phase, depending upon the particular direction of the antenna pattern, occurs in the form of an amplitude modulated rotating signal. Angular information in the azimuthal plane is obtained from a comparison of the reference phase with the rotational phase. In one of the two receiver sections a demodulated signal is applied to a frequency multiplier having a multiplication factor k, which is selected as a whole number multiple (k = 360.n) or as a fraction (k = 360 : n) of 360.

Abstract: In an instrument landing system (ILS), an aircraft is provided with apparatus for receiving from a ground-based transmitter overlapped modulated beam signals, which, when processed by the receiver, provide information about the position of the aircraft relative to a desired navigation course. Provided in the aircraft receiver apparatus is an antenna for receiving the transmitted beam signal, and an RF amplifer for amplifying the received signals. The received signal energy is divided between two recovery lines, each recovery line being routed near a separate series of ring filters, with the ring filters adjacent one recovery line substantially eliminating the signal energy in that line associated with one of the beams, and the ring filters adjacent the other recovery line substantially eliminating the signal energy in that line associated with the other beam.

Abstract: An indicator for a flight director instrument particularly for use in rotary wing aircraft includes a command cue having a shape resembling that of an associated aircraft control element or stick and includes cooperating indicia representative of the direction to move the control stick so as to center the cue and thereby satisfy the command. This novel indicator arrangement engenders an instinctive pilot response to move the associated control stick to satisfy the flight director command.

Abstract: A sounding vibrometer which is characterized in that it comprises a sensor comprising a geophone with its test-lead point mounted by way of a plurality of cable-type damping devices on small columns rigidly attached to a plate affixed to a tubular section of a segmented rod.

Abstract: An apparatus mounted in an intercept or seeker missile for computing during the flight of the intercept missile toward a target, such as another or target missile, a continuous estimate of the "time to go" to the point of closest approach of the intercept missile to the target and producing a control signal which varies in accordance with the "time to go" and which may be used for such purposes as arming a warhead of the intercept missile, controlling the navigational system of the intercept missile, and the like.

Abstract: A direction finder having an antenna system adapted to receive signals and provided with a right-hand and a left-hand lobe system. By coupling means said lobe systems can be made alternately operative. A comparison means is arranged for comparing received signals. Said coupling means is arranged to make operative only when main antenna and a first comparison means is adapted to compare the signal intensity in the right-hand lobe system with the signal intensity of said main antenna. A first indicator is arranged to be activated as soon as the signal intensity of the main antenna exceeds the signal intensity of one of the lobe systems. A second comparison means is arranged to compare signal intensities received on the right-hand and left-hand lobe systems. A second indicator is arranged to indicate the output signals of said second comparison means.