Abstract: A method of determining a reference seismic velocity model that includes lateral and vertical variations in a stratified subterranean medium is disclosed. The invention recognizes that each unknown prestack traveltime curve may be expressed as the sum of a best fit hyperbola and a non-hyperbolic perturbation term. After the best fit hyperbola has been determined and used to correct the traces for normal moveout (NMO), the non-hyperbolic perturbation term is solved for using a simulated annealing technique. In addition, the problem of topologically representing a subsurface having complicated horizon geometries is bypassed by assuming a smooth and continuous, rather than a layered and discontinuous, velocity model. This assumption facilitates raytracing and in most cases, results in a model that more accurately represents the velocity function. Error minimization during model updates is achieved by solving a linear system of equations subject to a set of constraint equations.

Abstract: An induced flow underwater vehicle motor cooling jacket adaptable to an urwater vehicle motor is provided. The cooling jacket has a self-priming inlet incorporated into the afterbody motor shell section which ingests seawater during either vehicle movement through the water or operation of the vehicle motor. The motor cooling jacket has a coiled tubing assembly, forming a heat exchanger with a variable tube cross-section, wrapped tightly around the motor. One end of the tubing is attached to the self-priming inlet and the coolant discharge nozzle at the opposite end of the tubing exhausts to the region immediately ahead of the vehicle propeller. Solder is applied between each coil to maintain strength and the tightly wrapped configuration of the cooling jacket.

Abstract: A sight cover for a sight, e.g. a gun sight, comprises first and second lens covers for the eyepiece and objective ends of the sight. The longitudinally displaced covers have three elastic cords extending in tension between the covers when the covers are in place. One elastic cord running adjacent the top of the sight is shorter than the other two cords causing a greater tension therein. On flipping the eyepiece end cover towards the top of the sight the top cord urges the eyepiece cover up and over the sight. The return of the three cords to their normal, untensioned positions springily displaces not only the cover from the objective end of the sight but also the entire sight cover away from the sight. The sight cover is tethered at one end to the rifle or the like.

Abstract: The invention provides an apparatus for the remote control of missiles or torpedoes launched from a launching container, by means of a cable of which a portion is wound onto a supply reel connected with the launching and of which the other portion is wound onto a supply reel in the missile or the torpedo. The supply reel in the launching container is arranged on the forward end of the container, and the supply reel in the missile or torpedo is arranged on the rearward end of the missile or torpedo. The cable section between the two supply reels, before the launching of the missile or torpedo, is fastened along the major portion of its length on the interior wall of the launching container, by means of a gluing arrangement which consists of a material whose combustion temperature is at least by 800.degree. C. lower than the melting temperature of the optical waveguide, or by means of a flexible clamping arrangement whose holding force can be adjusted.

Abstract: In an FMCW radar system, the velocity of obstacles relative to the radar couples a Doppler frequency shift into the return signal which causes an error in the range measurement. It is known to use a radar signal having a frequency ramp that both increases and decreases to distinguish the range of an obstacle from its velocity but when multiple obstacles are present this is not practical. By using a measure of velocity from a succesion of return signals, which of the radar output signals from the upsweep and downsweep of the radar signal that relate to a particular obstacle can be identified so that the range and velocity can be determined accurately. The FMCW radar system may be provided with a frequency scanned antenna, the beamwidth determined by the processing circuitry is variable according to the size of the obstacle being detected or the range at which the radar is searching for obstacles.

Abstract: A hollow turbine blade has cooling air feed passages in the wall defining the central cavity. The wall surfaces of the feed passages slope away from the central cavity in a diverging manner, so as to reduce the step difference in metal thickness between the passages relative to the thickness of metal dividing each passage and the central cavity. The temperature gradient from the blade external surface and the wall surface of the central cavity is thus also reduced, avoiding thermal stresses.

Abstract: A brush for cleaning the bore of a gun barrel includes groups of metal bristles and groups of nylon bristles secured to a twisted wire strand. The metal and the nylon bristles are formed into segregated groups and are arranged in successive and alternate sections with the nylon bristles on each side of the metal bristles. The metal bristles are phosphor bronze. The nylon bristles are colored in accordance with a color code to provide ease in identifying the correct brush size to clean a specific caliber bore. The brush also includes a cleaning cloth holder at the end thereof opposite from the end of the brush holding the bristles. The cleaning brush holder includes a small loop and a larger loop for holding different size cleaning cloths.

Abstract: A munition constituting a cartridge-launcher loader comprises a plurality of consumable modules each in the form of a flat strip of juxtaposed cartridges each comprising a payload of chaff, an ejector pyrotechnic charge, an electrical initiator, and a reusable support receiving the strips. The support has a system for immobilizing the strips and a handle for transporting and installing it. The strips are juxtaposed at their flat surface to perform a homogeneous block essentially constituting the body of the munition or a part thereof. The support includes a fixed plate carrying the strips and receiving the latter, when they are inserted, by virtue of them sliding in a general direction parallel to the plane of the plate.

Abstract: An improved reduced distortion spring spider for geophones is disclosed that has the desired ratio of spurious resonant frequency to the natural frequency of the geophone and can absorb the sharp lateral forces imposed on the geophone during destructive testing and field usage.

Abstract: The invention is a system for conducting a geophysical survey in a wellbore, comprising a battery-powered, self-contained borehole seismic receiver which internally digitizes and records an electrical signal generated by a transducer in the receiver, and a surface control unit which records the acoustic signature of the seismic energy source deployed at the earth's surface, controls the firing of the seismic source, and correlates the recording in the receiver to the recording of the source to determine the travel time of the seismic energy through the earth.

Abstract: There is presented an assembly comprising an underwater vehicle and a comation directional control and cable interconnect means therefor. The underwater vehicle remains underwater during travel of the vehicle through water. The directional control and cable interconnect means comprise arms extendible from sides of the underwater vehicle. Each of the arms includes a multiplicity of fins in a compact array for contact with the water through which the vehicle moves, each of the fins having an uncambered, neutral lift cross-section matching hydrodynamic streamline flow thereabout at predetermined vehicle speed below the cavitation threshold.

Abstract: There is presented an assembly comprising an underwater vehicle and a comation directional control and cable interconnect device therefor. The underwater vehicle remains underwater during travel of the vehicle through water. The directional control and cable interconnect device comprises a single arm extendible from one side of the underwater of vehicle. The arm includes a multiplicity of fins in a compact array for contact with the water through which the vehicle moves, each of the fins having an uncambered, neutral lift cross-section matching the hydrodynamic streamline flow thereabout at predetermined vehicle speed below the cavitation threshold.

Abstract: There is presented in combination, a water vehicle and a directional cont means therefor. The water vehicle includes at least a portion thereof which is underwater during travel of the vehicle through water. The directional control means comprises a plurality of symmetrically disposed arms extendible from sides of the underwater portion of the vehicle. The arms each include a multiplicity of fins in a compact array for contact with the water through which the vehicle portion moves, each of the fins having an uncambered, neutral lift cross-section matching the hydrodynamic streamline flow thereabout at predetermined vehicle speed below the cavitation threshold.

Abstract: The bore light includes a conductive shell that holds a battery and receives at one end a light bulb and at the other end a cap. The cap has a shaft which, upon being screwed into the cap, will press the battery against the bulb, thereby to cause the filament of the bulb to produce illumination.

Abstract: A pressure limit valve for well tools where a valve member is moveable between a first closed portion, an open position and a second closed position. A spring for closing the valve is separated from a locking chamber which contains locking elements. The locking elements are located in a locking chamber and are held deactivated by a release sleeve which separates from the valve member in an open position. When the valve moves to the second closed position it is locked by engagement of the locking elements with a stop shoulder. In use between closely coupled inflatable packers, the valve prevents trapped pressure between the packers from affecting operation of the packer valve.

Abstract: There is presented in combination, a water vehicle and a directional cont device therefor. The water vehicle includes at least a portion thereof which is underwater during travel of the vehicle through water. The directional control device comprises a single arm extendible from one side of the underwater portion of the vehicle. The arm includes a multiplicity of fins in a compact array for contact with the water through which the vehicle portion moves, each of the fins having an uncambered, neutral lift cross-section matching the hydrodynamic streamline flow thereabout at predetermined vehicle speed below the cavitation threshold.

Abstract: A cylindrical casing holds a spring mounted tape upon which is printed ballistic information. The user mounts the casing on a rifle and lines up a shot. While the rifle is in line to be fired, the user, with their trigger hand, extracts the tape from the casing to verify the ballistics of a projectile fired from the weapon by pulling a ring located at the end of the tape. Once the ballistic information is obtained, the user releases the ring which allows the tape to be retracted into the casing.

Abstract: A solid fuel ramjet tubular projectile has a generally tubular body fabried of dense material or suitable hardened material having a bore formed therethrough and having first and second ends. A plurality of partitions divide the bore into a plurality of separate combustion chambers. Each of the combustion chambers extends longitudinally substantially the length of the body. Solid fuel is formed upon the body within each of the combustion cheers. An inlet is formed at the first end of the body, into which air is received. The inlet is configured so as to substantially decelerate air entering the inlet at supersonic velocity to subsonic velocity prior to the air entering the combustion cheers. An outlet, through which combustion gases flow, is formed at the second end of the body. A mixing section is preferably formed intermediate the combustion chamber and the outlet so as to facilitate substantial mixing of the combustion gases from each combustion chamber prior to the combustion gases entering the outlet.

Abstract: A stator vane mounting platform is disclosed which provides internal cooling chambers which facilitates the flow of cooling air through the chambers and thus, the cooling of the stator assembly. Baffles define an upstream chamber and a downstream cooling chamber between adjacent stator vanes so as to maximize the airflow and, consequently, the cooling effects of this airflow. The internal cooling chambers are defined by a thick wall and a relatively thin wall, the thin wall being in direct contact with the hot gases passing through the stator assembly. Mounting lugs and flanges are directly attached to the thicker wall so as to mount the stator assembly to the turbine engine structure and to accommodate all of the mechanical stresses encountered during the turbine engine operation.

Abstract: A termination device and a method for terminating braided ropes or cables aramid fiber are described. The device includes a generally cylindrical coupling which is threaded at one longitudinal end and has an internal sleeve at the opposite longitudinal end thereof. The longitudinal end of the coupling surrounding the internal sleeve has an annular space for feeding aramid fibers therethrough and also has a smooth surface with curved end toward the threaded longitudinal end for flexion of the aramid fibers for bent over the smooth surface and has properly contoured second curved end away from the longitudinal end to prevent damage to the bent over aramid fibers.