Abstract: A detector unit for investigation of fluid currents in conducting liquids, uch as sea water, for example, employs two similar metal electrodes in contact with the fluid, one exposed to the fluid current and the other protected therefrom.

Abstract: 1.

Abstract: A device employing a permanent magnet is used to provide a sweep for magnetically activated marine mines.

Abstract: Disclosed is a transistorized sonar transmitter which includes a power suy, a variable frequency, variable power, switching output stage, the switching of which is actuated by suitable drive signals from a control signal generator and amplifier. The power output from said switching stage is controlled by a time-ratio-control circuit which regulates the voltage thereof by means of a variable duration TRC drive signal from said control signal generator and amplifier, the duration of which is proportional to the power output thereof.

Abstract: 1. A transducer comprising in combination,a plurality of piezoelectric discs arranged along a common axis of revolun in the order of increasing diameters in the aft to forward direction,resilient means interposed between each of said piezoelectric discs for the support thereof with a predetermined relative degree of freedom of movement,means effectively connected to the end ones of said piezoelectric discs for the urging thereof toward each other by compressing the resilient support means interposed therebetween and in such manner as to maintain the entire plurality thereof in a predetermined unitary geometrical configuration, andmeans connected to each of said plurality of piezoelectric discs for the driving thereof in electrical parallel.

Abstract: 1. A helicopter destructor comprising in combination,a hydrophone channel,a microphone channel,a barometer channel,an AND gate connected to the outputs of said hydrophone, microphone, and ometer channels,an explosive means, andmeans connected to the outputs of said hydrophone channel and said AND gate for detonating said explosive means when a trio of signals are simultaneously applied to the respective inputs of said AND gate.

Abstract: 2.

Abstract: 1.

Abstract: A sonar signal processing and display system is described which converts log return data to digital form for storage in a magnetic core memory, from which the data can be reconstituted as analog video signals for CRT display at a higher frame rate. Described are means for comparing new data to old to select updating data for the memory, and means for effecting CRT display of moving target tracks in a color distinct from stationary background returns.

Abstract: A surface contour sampling system is disclosed which intermittently measu the elevational irregularities in various and sundry surfaces, including those of the earth's terrain, model boards, and the like, with respect to a predetermined datum plane. A unique rotating bell crank and stepping surface sensing sampler combination permits the stepping upon and/or over large sloping or elevational changes by said surface sensing sampler, including those that are normal to the surface trend at any given location, without being stopped thereby, as it is moved forward along a predetermined path thereon by a suitable carrier vehicle.

Abstract: A stabilized viewing system is disclosed as having a telescope for viewing n object by an observer when the object is remotely located from the observer, a camera for timely photographing a succession of pictures of the object on a film that is processed immediately prior to exposure of the object of the film by a processing fluid which causes a positive image to be produced on the film after exposure of the object on the film which may be viewed by the observer immediately thereafter, a unique movable linkage-type servomechanism connected between the telescope and the camera for enabling one or the other to be selected as desired by the observer, in order that he may either view the object directly or the filmed image thereof, and a magnifying eyepiece disposed in such manner with respect to the telescope and the film of the camera that either one or the other may be observed in magnified form.

Abstract: An automatic adjustable radiant energy filter system adapted for protecting uman eyes (and other optical devices) from dangerous intensities of laser light or other types of radiation during experimentation therewith is disclosed as including a pair of relatively moving polarized filters, one of which is automatically positioned with respect to the other as a consequence of a unique photodetector and negative feedback system combination sensing and controlling the aforesaid laser light radiation that passes therethrough in accordance with a predetermined intensity level.

Abstract: A laser scan converter is disclosed which converts the scan of a laser li beam in one plane--say, a horizontal plane--into a scan thereof in another plane--say, a vertical plane. The invention comprises a rotating multi-faceted mirror which, as it rotates, intercepts in a first plane a laser light beam that optionally has passed through a semi-mirror and reflectively scans it back to the reflective surface of said semi-mirror which re-reflects and redirects it to a full mirror which, in turn, re-re-reflects and re-redirects it to a predetermined surface of a utilization apparatus, the surface of which is located in a second plane that is different from the aforesaid first plane--say, one that is perpendicular thereto.

Abstract: A soft abrasive tool is disclosed as comprising a solid molded mixture of edetermined quantities of an aluminum wool material and a catalyst setting elastomeric polyurethane binder material, the unique combination of which has been mixed, molded under pressure, and cured at room temperature in such manner as to have a disc-like, cup-like, or other predetermined geometrical configuration. A power source -- such as a motor or the like -- may be used to mechanically drive the aforesaid soft abrasive tool, so that it will cut, grind, and remove polyurethane paint, polysulfide sealant, and other soft coatings from aluminum aircraft skin without damaging the substrate aluminum thereof when held thereagainst.

Abstract: A universal timing circuit for enabling numerous different types of charge oupled devices is disclosed which permits the operation thereof to be established over a wide range of counted and programmed clock input frequencies, thereby facilitating experimentation in faster scanning techniques, such as, for example, those which might be required when charge coupled image sensing devices are used as substitutes for vidicon tubes in various and sundry television systems.

Abstract: An optical image generation and projection system is disclosed as including light relay type image generator for transforming an invisible electronic signal into a visible amplitude modulated image having interferential contrasts on an oil layer and a light source and lens system associated therewith in such manner as to project the optical image generated thereby onto a projection screen.

Abstract: A human head trackable wide angle visual system is disclosed which probes y given terrain constructed on a model board and causes selected image portions thereof to be projected on a trio of display sectors located on the inside of a spherical screen, with the view thereof being displayed thereon in accordance with control signals that are respectively portional to the turning of said head about a predetermined axis thereof. A head position sensor, a cockpit, a switching logic circuit, a synchronization signals generator, a trio of video switches, the aforesaid screen, and left, middle, and right light projectors are uniquely combined to provide such effects and, thus, simulate a real-life pilot training environment from a model thereof.

Abstract: A system is disclosed for displaying a life or other size replica of a moboard or other scene in a non-programmed and real or other time manner, whereby said displayed replica constitutes a realistic ambient environmental simulation which may be used to facilitate the training of people in various and sundry situations, such as, for example, in piloting aircraft, tanks, automobiles, and other automotive devices, and the like. As disclosed, a modelboard scene is optically observed by a unique annular probe which forms an annular optical image thereof, rotates said annular optical image, and then timely converts it to a plurality of electrical signals proportional thereto.

Abstract: A sampling nozzle is disclosed which includes an inlet valve that automatlly adjusts the opening thereof in predetermined inverse porportions to the pressures applied thereto by the fluid and/or other substances being sampled thereby. Whenever a constant pressure suction pump is effectively connected to the outlet thereof, isokinetic sampling is achieved within a system of varying velocities of the aforesaid fluid and/or other substances and, thus, a substantially fixed sampling rate is maintained with respect thereto.

Abstract: A vibration sensing and measuring system is disclosed as including a series connected signal generator, vibration sensor adapted for being connected to any appropriate compatible object from which the vibration information and/or parameters analogous thereto are desired, and utilization apparatus - such as, for example, a readout - for indicating or otherwise utilizng the measured vibrations of said vibrating apparatus. When the aforesaid object vibrates, said sensor vibrates in synchronism therewith; thus a liquid disposed therein is disturbed in such manner as to cause standing waves at the surface thereof that are proportional thereto.