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"Rail travel at high speeds is not possible because passengers, unable to breathe, would die of asphyxia."
Dionysius Lardner, Professor of Natural Philosophy and Astronomy at University College, London ; 1830
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| Number | Title | Issue Date |
| 4347738 | Oceanographic transducer 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.... | 09/07/1982 |
| 4220108 | Minesweeping method and apparatus A device employing a permanent magnet is used to provide a sweep for magnetically activated marine mines.... | 09/02/1980 |
| 4215631 | Sealed pyrotechnic delay Disclosed is an improved underwater half-second pyrotechnic delay device ing an elongated tubular housing with a pair of holes for respectively threading suitable detonating cords through each end thereof. In operational burning series within said tubula... | 08/05/1980 |
| 4215428 | Time ratio controlled inverter 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 powe... | 07/29/1980 |
| 4114135 | Acoustic device A system for monitoring air-water borne noise generated by an aircraft flg over a body of water from within the aircraft includes a sonobuoy having a phase linear array of hydrophones suspended beneath the surface of the water and an electromagnetic rada... | 09/12/1978 |
| 4067025 | Self developing camera for use in macrophotography and endoscopic pathology An endoscopic photographic system includes the body inserted endoscope cocted via a fiber optic bundle to a photographic lens carrier in a focusing mount. The photographic lens is provided with a compound sliding mount which positions it on a camera back... | 01/03/1978 |
| 4051424 | Digital amp-hour monitor An amp-hour monitor is provided to determine the power expended by a marine attery power supply system. Digital processing circuitry monitors a selected battery system and provides a readout of the power expended using a digital display. Additionally, a di... | 09/27/1977 |
| 4010619 | Remote unmanned work system (RUWS) electromechanical cable system A tethered underwater work system comprises a primary lift module attached o a support vehicle by means of a primary tether. A submarine work vehicle is removably attached to said primary lift module and connected thereto by means of a secondary tether. Ad... | 03/08/1977 |
| 4009452 | Submersible power package A submarine power package converts direct current electrical energy to alnating current energy and is adapted to function while exposed to the high pressures of the deep ocean. A diode protection circuit and special semiconductor mounting arrangement mak... | 02/22/1977 |
| 4008567 | Torque control system A torque control system designed to economize on consumed fuel includes a source of motive power, a load and a transmission coupling the motive power to the load. A torque measuring device is attached to the output of the transmission and senses a torque ... | 02/22/1977 |
| 4004540 | Galvanic detector for detecting the cutting of a command wire An apparatus and method for detecting the presence of, and severing command ables submerged in an aqueous medium, utilizing a galvanic current pulse generated by a galvanic cell with one electrode thereof serving as a cable cutter.... | 01/25/1977 |
| 4000648 | High sensitivity flowmeter An oceanographic flow sensor for use in component type electro-magnetic fmeters includes a pair of spaced electrodes and a conductive coil wound thereabout having a small enclosed area. A sensor construction is also disclosed having a plurality of mutual... | 01/04/1977 |
| 3999331 | Apparatus for making high-pressure ports in closed hulls An in situ refurbishing system for viewing ports aboard pressure-tight hu includes a guide shaped to cooperate with the viewing port and provide a datum axis centered thereon. An axle is rotatably supported by the guide and carries a lapping tool in poli... | 12/28/1976 |
| 3992573 | Stereoscopic viewer power supply An improved power supply for alternate frame stereoscopic image presentat system includes a switch circuit for triggering two light valves mounted to present alternate left-right images to a viewer. A delay circuit using a variable pulse length monostabl... | 11/16/1976 |
| 3990401 | Marine mammal vacuum recovery system A recovery system for attaching a line to an underwater object includes a cially worn tool holder adapted to be carried by an underwater mammal which supports a surface engaging tool at the forward end thereof. A signalling mechanism is also included to b... | 11/09/1976 |
| 3990123 | Inflatable sonar array A portable submerged structure uses fluid pressure to extend a plurality of lexible conduits until the conduits become rigid. In such a rigid configuration the flexible conduits provide a rigid support which is independent of any further moorings or other ... | 11/09/1976 |
| 3987708 | Depth insensitive accumulator for undersea hydraulic systems An underwater hydraulic pressure regulator includes an ambient pressure ronsive cylinder and a regulator cylinder which are each fitted with integrally coupled pistons. The ambient pressure cylinder, as the name implies, is opened to ambient pressure by ... | 10/26/1976 |
| 3987292 | Discrete Fourier transform via cross correlation charge transfer device A circuit for generating a discrete Fourier transform in real time employs a digital and analog shift register, each cell of which is tapped to feed an analog switch. The outputs of the individual analog switches are fed to a summing bus where the switche... | 10/19/1976 |
| 3986159 | Air dropped sonobuoy An installation mechanism for an underwater flexible structure includes a urality of pressure controlled pumps which distend a flexible underwater structure and provide fluid pressure to support such structure in an operative, distended position.... | 10/12/1976 |
| 3978813 | Propeller-driven hydrophone array tensioning device A tensioning device for submarine oceanographic structures includes a sure float having a pendent line suspended therebeneath and a vertical rod support attached to the distal end of the pendent line. An electrical motor attached to the lower end of the ... | 09/07/1976 |
| 3978334 | Precision laser beam deflection detector An improved optical measuring system for measuring the deflection or dispement of a beam of coherent light energy is disclosed as including a Faraday rod having magneto-optical properties in conjunction with a polarizer and analyzer at the entrance and e... | 08/31/1976 |
| 3976369 | Alpha meter attachment for underwater optical systems An improved viewing port for underwater oceanographic vehicle provides for establishing a standard length optical test path in the underwater environment with no modifications or additional passages through the hull of the vehicle.... | 08/24/1976 |
| 3953828 | High power-wide frequency band electroacoustic transducer 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 indiv... | 04/27/1976 |
| 3949212 | Underwater lighting for defense against swimmer attack 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 i... | 04/06/1976 |
| 3946696 | Automatically controlled magnetic minesweeping system 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 energi... | 03/30/1976 |
| 3944967 | Updated diver navigation device In a diver's navigation system employing a receiver having three equal, alarly disposed hydrophone locations, a digital signal processing circuit is employed which receives frequency shift keyed digital data from remote beacons. Circuitry is provided to ... | 03/16/1976 |
| 3942150 | Correction of spatial non-uniformities in sonar, radar, and holographic acoustic imaging systems An improved method and apparatus for processing electronic signals for use n establishing an improved image display includes storing the electronic and acoustic response of all the detectors in response to impingement thereon by a plane wave-front as store... | 03/02/1976 |
| 3940674 | Submarine or vehicle steering system Four direct current motor systems are controlled by a single hand grip cool device. Two of the motor systems have interacting control parameters while the remaining two are controlled independently of the other motor systems. The hand operated control me... | 02/24/1976 |
| 3940286 | Deep sea pressure compensated expendable energy source An improved power source for marine applications includes a salt water acated battery adapted for actuation after a specific predetermined immersion time. The improved battery construction is characterized by an enclosed volume of flexible, plastic mater... | 02/24/1976 |
| 3940732 | Buoyant electrode and system for high speed towing An electrode structure is disclosed which is particularly adapted for high ensity electrical current transfer to sea water. The electrode of the invention is adapted to be towed within sea water by an aircraft at high rates of speed. The electrode comprise... | 02/24/1976 |
| 3934082 | Post detection device for eliminating backscatter The deleterious effects of backscattering on a video image received from a urbid environment is minimized by using a vertical raster scan combined with appropriate filtering between the camera and monitor.... | 01/20/1976 |
