Abstract: A hose-like hydrophone array is insensitive to ambient pressure variations hile retaining an acceptable performance capability. Ferroelectric cylinders mount rigid cylinders at opposite ends and are separated by elongate lengths of corrugated tubing. A dielectric oil fills the cylinders and lengths of corrugated tubing to make the array relatively insensitive to pressure variations. Since the dielectric oil is several times (five to 10) more compressible than the ambient water, the ferroelectric elements can more compliantly respond to a broader bandwidth of impinging or radiated acoustic energy. The radially rigid lengths of tubing hold a greater volume of the relatively compressible oil to permit this response.

Abstract: An acoustic lens for marine doppler sonar apparatus of the type in which acoustic energy is radiated and received along a beam directed at an angle with respect to a ship's axis is fabricated so as to have an external surface substantially flush with the ship's hull and an internal surface angularly disposed with respect to the external surface. Electro-acoustic transformation elements are mounted on the internal surface. The lens material is selected to have an acoustic propagation velocity greater than that of water so that acoustic signals are refracted in passing across the lens-water interface. The lens prevents spurious acoustic signals that would ordinarily be reflected from the aerated water close to the ship's hull from reaching the electro-acoustic transformation elements.

Abstract: A method and apparatus for seismic prospecting in a body of water which comprises trailing a gun adapted to initiate explosively-operated charges at a sufficient depth below the water's surface to allow the creation in the body of water of high-pressure waves, and detecting the pressure waves with a detector assembly including a housing having a flexible, sound-transmitting wall defining a chamber, an incompressible liquid completely filling the chamber, and a detector probe completely immersed in the incompressible liquid.

Abstract: A 30-30 casing has sharpened rings formed in its enlarged base. Powder is packed in the casing, and it is sealed by inserting a primer portion, which is a 38 caliber pistol shell with a primer, in the open end of the packed casing and compressing the edge of the casing in the base area of the primer portion.Radial extensions on the casing hold the cartridge centered in a barrel spaced from a firing pin.The primer is ignited by hitting the sharpened rings against an underwater object and thus driving the cartridge and primer rearward against a fixed firing pin. The casing rockets forward out of the barrel, leaving the primer piece and smashing into the underwater object while the powder burns.

Abstract: This invention relates to the design and manufacture of a fragment shell usable in a warhead, with the novelty including the use of discrete fragments contained in a sleeve or tubing of considerable length, by virtue of which containment the fragments can be arrayed in operable form easily and rapidly.

Abstract: A control system for a pair of hydraulic lift actuators for adjusting the position of a blade-carrying frame of a motor grader includes a pair of control levers respectively operatively connected to a pair of direction control valves which are, in turn, respectively connected to the pair of actuators and selectively operable by means of the levers to place the actuators in neutral, extension, retraction, and float conditions. Each of the levers includes a hollow handle section having an electric switch mounted therein and a finger-operable sleeve is reciprocably mounted on the handle section for selectively closing the switch. Each switch is connected to an electrically responsive portion of a respective one of the control valves and when closed causes the valve to shift to effect the float condition in an associated one of the actuators.

Abstract: A pneumatic gear motor application in which a tank filled to a predetermined pressure with an inert gas such as nitrogen is heated by a heat squib device to raise the temperature of the gas and also to increase the pressure of the gas in the storage tank and be supplied through a first frangible valve to a pressure regulator for regulating an outlet pressure to a servo valve for controlling flow to and from a pneumatic motor. The pneumatic motor drives through a reduction gear mechanism that drives a worm and worm gear to actuate a control fin of a missile. The missile has four drive motors and four control fins to provide guidance for the missile.

Abstract: Improved low frequency electro-acoustic transducer apparatus of the type employing two piezoelectrically driven flexure discs mounted at the ends of a short cylindrical housing containing an acoustic mismatch fluid, is provided. The piezoelectrically driven flexure discs are constructed as assemblies having a plurality of concentric piezoelectric laminar sandwich units to excite the flexure discs. By individually electrically exciting the concentric sandwich structures through band-pass filters and a selective interconnection network, the flexure discs function with a plurality of resonant frequencies of flexing to provide broad band and efficient operation.

Abstract: A crimping die which is movably mounted in one end of a shotgun shell crimping sleeve has a conically shaped side wall which permits the crimped end of the shell to overhang the crimping die to cause ironing of the crimped end of the shell against the rounded crimping corner of the crimping sleeve when the crimping die is withdrawn from the crimped shell.

Abstract: A small electrical fuze for use with an explosive projectile being subject to very high g forces both in the direction of and opposed to the line of flight. A lead charge is disposed in a barrel rotor whose axis of rotation is normal to the flight path for providing the safing and arming function. A system of controlling drive balls captured in shaped slots on the surface of the barrel rotor in cooperation with straight slots on an interior surface of a mounting cavity provide the necessary forces for a multiple step arming sequence in response to spin-induced forces on the fuze. These multiple step sequences include two direction reversals. A one-fourth wavelength shorted skirt surrounds the fed end of a monopole antenna to isolate the radio frequency currents thereon from the body of the projectile thereby improving the antenna pattern in the direction of trajectory.

Abstract: 1. An apparatus for producing low frequency compressional waves under water hich comprises two circular plates spaced in opposed parallel relation, a plurality of reciprocating fluid motors arranged in parallel between said plates, an independent fluid pump hydraulically connected to each of said motors for driving the same, a by-pass valve for each motor adjustable to vary the length of the stroke of such motor, a prime mover coupled to drive all of the pumps in synchronism, whereby the motors connected thereto reciprocate in unison to move said plates toward and away from each other at a frequency corresponding to the speed of the prime mover, and means for adjusting all of the by-pass valves in assembly, whereby the amplitude of oscillation of said plates is correspondingly varied.

Abstract: An unknown explosive device is safely neutralized, that is, rendered inoptive, without disturbing the device, by penetrating the device with an explosive-driven captive projectile from a safe distance and injecting liquid nitrogen into the device through the projectile to cool some internal parts below the temperature at which they are operative.

Abstract: A jacketless hunting projectile or bullet of the mushrooming-tip, high cutting-type has a projectile body including a solid cylindrical guide part and a hollow head tapering toward a point. The hollow head has a progressively increasing wall thickness toward the solid part of the bullet and defines a cylindrical hollow space which receives a filling of a spreading material forming the tip of the projectile. This material rolls back the head after splitting it along notches formed in the hollow wall with sharp edges.

Abstract: A firearm cartridge assembly consists of a casing having a bullet mounted in one end and an explosive charge in the opposite end with a wad extending between the two end elements. The wad has a generally cylindrical configuration and includes a first end and a second end each containing a similarly shaped recess. The first end in the assembled position contacts the explosive charge and the second end contacts the trailing end surface of the bullet. Located between and spaced axially from the ends of the wad is a centrally located disc-shaped section extending transversely of the axis extending between the ends and having an outer periphery generally conforming to and in surface contact with the inner surface of the casing so that the disc-shaped section forms a seal with the casing against gas leakage when the charge is exploded.

Abstract: A thin walled steel cartridge case having a substantially larger internal volume than a conventional cartridge case. The cartridge case is fabricated from a high strength, heat treated carbon steel or boron steel and the wall contour in the head area is designed to avoid localized high stress. A low friction coating is applied to the outer surface of the cartridge case and serves to reduce stress concentrations in the head area and to reduce extraction force in the event of interference between the case and the chamber during extraction.

Abstract: A composite plastic-glass frangible rotating band, for a spin launched prctile, has epoxy filled annular stress risers embedded within its inner wall. The composite rotating band is designed to be resistant to compressive forces exerted thereon while in the gun barrel, but to fragmentize when suddenly subjected to tensile stress impressed thereon when exiting from the muzzle of a gun.

Abstract: Expendable case ammunition of the type which is expelled as a unit through the barrel of a firearm and whose case separates from contained projectiles in flight, comprises a body and a cap, and may include a separate projectile container. These parts are made of a deformable material such as plastic, and are snap-locked together. The body has an interior transverse wall separating a projectile chamber from a propellant chamber, which is enclosed by the imperforate cap to permit the use of loose propellant and to protect against contamination and accidental ignition. An anvil is integrally formed in the propellant chamber wall to cooperate with an internal primer and a firing pin which penetrates the cap. A diaphragm region of the cap is ruptured by initiation of the primer, and the cap remains attached to the body during ignition of the propellant and travel of the ammunition unit through the barrel of the firearm.

Abstract: A hypervelocity ammunition round in which a fin stabilized artillery projile contains a plurality of subcaliber gun tubes for launching subcaliber fin stabilized flechette projectiles from the artillery projectile at a predetermined point in its trajectory, as the artillery projectile performs as a moving gun platform to more effectively defeat a multiplicity of targets through the kinetic energy impact of the subcaliber projectiles. The round utilizes a traveling charge arrangement in launching both the artillery projectile and each of the subcaliber projectiles.

Abstract: A transducer assembly in which a transducer unit of a piezoelectric material which is rigidly held between a rear member and a front member, both of which are made to vibrate upon energizing the piezoelectric material. Inductive elements comprising copper conductors wound about iron cores and utilized in the tuning of the transducer assembly are rigidly connected to one or both of the members and may also be connected to the transducer unit itself to serve as a portion of the inertial mass which imparts a mechanical vibrational characteristic to the transducer assembly. In one embodiment of the invention, the rear member is provided with a void wherein there is nested an inductor having an inertia similar to that of the material removed from the rear member in forming the void.

Abstract: The device for transmitting or receiving ultrasonic waves or pulses to and from well-defined adjustable directions or distances includes a capacitive transducer consisting of a layer of dielectric material tightly packed between two electrodes, one at least of which is formed of an appropriate array of elongated strips of circular or rectilinear shape.