Abstract: A sonar system is disclosed which incorporates a first receiver for receig an acoustical signal from a target via a vertical path sector of water encompassing said target, a second receiver for receiving an acoustical signal from said target via a horizontal path sector of water also encompassing said target, and readouts for displaying the images of said target along with the physical characteristics of said vertical and horizontal water path sectors encompassing it. Selector switches are employed that enable an operator to select any one of a number of said vertical and horizontal water path sectors and to highlight them if desired, so as to optimize the target image as a result of selecting the water path sectors having the least signal resistance. Optionally, the subject sonar may be made active by including a target search signal broadcasting means, so the aforementioned received acoustical signals will be target echo rather than target source signals.

Abstract: Apparatus is described for remote VOR (voice operated relay) control of a pe recorder having a single control element, e.g., a push-button, for effecting both pause and run functions on alternate actuations. A function feedback signal conditions a logic network so that solenoid actuation of the push-button occurs only in response to appropriate VOR logic command signals.

Abstract: The invention utilizes a vertically positioned arc lamp and associated lamp ollector-reflector in conjunction with depending associated secondary and projection mirrors, the projection mirror being convex and centrally apertured to form an exit pupil closely adjacent and above the head of an observer and in the center of a curved projection screen to minimize perspective distortion of image as seen by the viewer. The invention further provides an elimination of shadow effect by the depending relationship of the apparatus and by the recessing of arc lamp electrode through an aperture in the lamp reflector. An adaption of image spacing by recessed fitting of image on film to adapt the film to intended projector image width is also an aspect of the invention.

Abstract: A spool wherein line pay out is limited to a selected length by a pin that s retractable from one or more loops previously formed in the line and extending through a spool flange opening. A detented thumb wheel is eccentrically connected to the pin for retraction thereof.

Abstract: An explosively powered tool or wrench is described that is operable under water and provides high torque, approaching that of an impact wrench, through the detonation of small charges to generate pressure for driving pistons of an expansible chamber motor. The invention is characterized by a rotating magazine for automatically or manually bringing charges into firing position, a magazine position indicator, and electrical firing control circuitry.

Abstract: A hydrodynamically streamlined, towable sonar apparatus is described charerized by a housing, including a central frame having a circular planar web portion from which extend a plurality of annular coaxial ribs which cooperate with similar ribs extending inwardly from top and bottom concavo-convex cover members to define annular chambers and to provide compressive load bearing support. Transducers are arrayed on the periphery of the frame and enclosed in a curved plastic fairing thereabout. Electronics are accommodated in the annular chambers.

Abstract: A manually operable self-loading trailer of wagon configuration is descri wherein tailgate ramps are operated by jacks to elevate rear end of trailer while rear carriage is moved adjacent front carriage, and then to lower rear end of bed to near ground. Jacks incorporated in carriages permit altering of bed height and attitude and aid in converting trailer to tandem axle semi-trailer.

Abstract: A conversion system is disclosed for generating a desired bandpass waveform rom digital samples of a lower frequency, bandlimited original waveform. The system utilizes a single digital to analog converter and an impulse driver to generate a weighted pulse train that contains frequency shifted replicas of the primary spectra of the original waveform. Bandpass filtering rejects all but selected replica spectra for reconstitution.

Abstract: A water wave height and fluid level measuring system is disclosed as having buoyant support mast which floats partially above water and partially below water in a substantially vertical disposition. A radio frequency transmitter is mounted on said mast above said water, and a plurality of radio frequency receivers are mounted on said mast at spatially disposed positions along said mast and submerged within said water. Telemetering, receiving data processing, and readout means are effectively connected to said receivers for communicating the output signals therefrom to predetermined remote or other locations, with said output signals being analog signals which represent water wave height or other fluid level at any given instant.

Abstract: A pulse-width doubler is disclosed as comprising a bistable multivibrator ving a first input, a second input, and an output, for producing a first signal at the output thereof in response to a predetermined second signal being supplied to the first input thereof and for producing a third signal that is different from said first signal at the output thereof in response to a predetermined fourth signal being supplied to the second input thereof.

Abstract: A cryogenic magnetic field gradiometer is described wherein adjustments of areas presented by a superconducting wire loop, that is confined in a support structure within a cryogenic environment, are adjusted mechanically through wire positioning elements operated by a plurality of parallel shafts extending to the exterior of the environment. In one embodiment the positioning elements are cams that cooperate to position portions of a wire loop, while in another form bell crank levers are used.

Abstract: A breech and latch mechanism is described herein for use in an aircraft mile ejection launching system. The described mechanism is characterized by a fluid actuated piston that rotates a bell crank and link from a hook locking over-center position to a hook retracting position. The piston acts also as a sequencing valve to pass fluid to pressure actuated ejection rams. A pressure fluid distributing orifice structure and a pyrotechnic cartridge igniting firing pin structure are described also.

Abstract: A diver's exhaust valve is described that is characterized by small size, ooth flow, and freedom from fouling by foreign matter. The valve comprises a valve member in the form of a spring and water biased diaphragm that separates the exhaust gas from the water which acts to close the valve. The disposition and configuration of flow passages produce continual flushing, while permitting adequate flow with a valve of smaller than usual size.

Abstract: An electroacoustical transducer assembly employs a plurality of focused poelectric elements. Each of said elements is made of a plurality of individual sections and energized to produce a radiation pattern having desired geometrical properties. The individual piezoelectric elements are figured to improve the frequency bandwidth and to provide for improved electrical connection thereto.

Abstract: 1.

Abstract: A pitch synchronized helium speech unscrambler is disclosed as including a air of bucket brigade analog delay lines which are timely and rapidly loaded with the electrical signal equivalents of human voice signals that are effectively supplied thereto by a receiving transducer. Said voice signal equivalents are then respectively unloaded more slowly from said pair of bucket brigade delay lines than they were loaded therein by a pair of different frequency clock generators driven in alternate successions by preprogrammed signals divided out from a master oscillator and in synchronism with a predetermined pitch portion of the speech signal received by said receiving transducer. The unloaded signals are then broadcast as acoustical voice signals by a transmitting transducer.

Abstract: An underwater light unit is constructed to be placed together within simi units around a ship anchorage on the bottom of a body of water. The construction of the optical portion of the housing permits the uniform illumination of said bottom with a high intensity light so as to produce good silhouette in the volume of water space located above the light units, as well as permitting direct observation of objects on said bottom. The optical portion and base portions interfit in such a manner as to have their watertight integrity remain uneffected by nearby explosions. The housing and mounting stake are constructed and arranged so as to provide a low mounting height above the bottom, so as not to interfere with the passage of surface vessels through the illuminated water space.

Abstract: The invention is an automatically controlled magnetic marine mine sweeping ystem that does not constitute a safety hazard to the ship deploying it. It includes a ship that trails a pair of electrodes within the water which are, in turn, electrically energized by a variable current generator to induce a magnetic field therein. The intensity of said magnetic field is sensed by a magnetometer; and by means of a closed-loop, negative-feedback circuit incorporating said magnetometer, said current generator, and said sea water, the intensity of said magnetic field is limited to the extent that it does not extend under the ship and detonate marine mines that are close enough to be destructive thereto.

Abstract: A free-running river mine disabler having a float which is propelled under he river surface by means of the river current. A wire cutter is towed along the river bottom by said float in such manner as to sever the ignition wires of electrically detonated mines.

Abstract: A sonar system for detecting and identifying objects laying on or submerged n a sea floor having a dual frequency transmitter and a dual frequency receiver for timely broadcasting and receiving a pair of relatively high and low frequency acoustical signals, respectively, in accordance with a predetermined timing program which facilitates the display and interpretation thereof.