Abstract: 1.

Abstract: This invention relates to cryptographic teletypewriter systems and more picularly to an electronic device for use in such systems which automatically provides permutations of a Vigenere Square.

Abstract: An apparatus for sealing a pressurized vessel comprising a hemispherical ped door with an outer rigid surface, an insulating material, an inner rigid material with a flange affixed thereto, and a supporting member for use in combination with lock and hinge mechanisms, the flange on the door cooperating with an inflatable seal that is seated within a groove positioned on the inside surface of the mouth of the vessel.

Abstract: Apparatus for use with graphic material supported on a planar surface. Two identical clamps, upon which a reeling means is mounted, are connected by a tape and mounted on the edge of the planar surface. The clamps are U-shaped and have a longitudinal slit in one leg. On the other leg a spool means supported by a housing is attached by a bracket. Each end of the tape is threaded through the slit, around the clamp and connected to the spool means.

Abstract: A fast, large aperture, electrically actuated shutter mechanism capable of ithstanding high power densities. The shutter's ability to withstand high power densities is achieved by making the shutter plate highly reflective on one side and providing cooling means on the opposite side.

Abstract: A device which will attenuate a 10.6 micron wave length light beam from 1% of the original intensity. The original intensity can be as high as 1000 watts. The unit is an absorption cell of variable path length filled with a gaseous mixture of sulfur hexafluoride and nitrogen at a total of one atmosphere. Power attenuation is accomplished by SF.sub.6 - absorption and energy exchange to N.sub.2 or walls. The output is controlled by a motor which moves one of the two windows thus changing the absorption path.

Abstract: An electrical circuit providing for equal power consumption by the included oad elements when selectively energized by independent power sources of differing voltages, through control of the path of current flow through the load elements by rectifiers, the rectifiers being disposed to permit current flow in a direction through the load elements in series when a high voltage source energizes the circuit through one pair of terminals and, without alteration of the circuit, in parallel through the load elements when a low voltage source energizes the circuit through another pair of terminals.

Abstract: A system by which in situ observations of optical damage induced in optical omponents by intense thermal radiation may be made. The process includes the determination of the spectral transmission wherein a scanning monochromator is used to illuminate the sample elements with a light beam of monotonically changing wavelength, and the transmitted light is detected and its intensity recorded as a function of wavelength. Optical damage is detected by the resultant changes in the spectral transmission curve.

Abstract: A lifting body missile is controlled by pitch and roll commands wherein the aw autopilot is caused to change in accordance with the roll and estimated angle of attack input information. A command logic is provided to determine the polarity of the command signals to the autopilot.

Abstract: The off axis angle detector of a radar is sampled at discreet intervals by special purpose digital computer. Each sample is directed to one of a plurality of registers in accordance to the angle indication of the sample. Each register being a counter which will give an output when it is in an overflow condition; therefore, each register acts as a threshold device. Upon one register overflowing and giving an output of that indication, the sample process is stopped and the output of the register is sent to a converter to indicate the direction of the jammer. This is done both for the azimuth and elevation angle of the radar receiver.

Abstract: A shield for shielding against radiation from a nuclear blast. The shield comprised of an aluminum body structure, a tin sheet bonded to the outer surface of the aluminum body structure, a glass filament reinforced epoxy resin matrix composite plastic material wrapped about the tin material and an outer layer of external thermal ablative insulation. The glass filament wrapping of the tin material causes the tin material to act as an effective shielding material by maintaining integrity of the tin when exposed to radiation.

Abstract: A vehicle which can easily be dismantled into transportable units and reassembled readily at the tunnel site is provided. A major advantage of this vehicle is the requirement of low thrust during operation and adaptability to use in short tunnels and tunnels with variable rock formations. With only minor adjustments to the drill head assembly and crawler carriage, it is capable of conforming to variable diameters of tunnel sizes. Pneumatic drills in the drill head assembly are guided along the vehicle's path to cut kerfs into the rock. Fluid activated breaker elements enter the kerfs and break out the ridges of rock through smashing blows. The drill head assembly rotates as the kerf cutting process is repeated. The excavated rock is conveyed to the rear of the vehicle for easy disposal. The drills are capable of boring any type of rock, therefore, it is envisioned that this vehicle can excavate soft through very hard formations.

Abstract: A telescoping retractor comprised of a two stage cylinder assembly actuated y an electroexplosive power cartridge. A pair of cylinders are mounted in concentric relation. A piston rod is carried in the inner cylinder. The power cartridge produces the gas which sequentially retracts the outer cylinder, the inner cylinder and then the piston which is secured to the structure to be retracted.

Abstract: Optics capture and concentrate laser radiation and send it through a gasdynamic window which is formed by supersonic expansion of unseeded hydrogen gas exiting a passageway directly under the opening. Seeded fuel is inserted into the chamber where it is heated by the laser radiation and the energy of the heated gas is converted into kinetic energy of a high velocity by means of a rocket nozzle.

Abstract: Alignment of sync pulses is provided by an automatic selection of a proper ath, which is delayed or not delayed, of the sync pulses. The selection is made on the basis of error criteria. A comparator compares the sync pulses and sends an error signal to a sync pulse adjuster which makes the determination of the path to which a sync pulse is directed.

Abstract: An assembly which is an energy absorbing system for supporting the nose c of a missile in a position extended from the guidance section prior to eject (launch) of the missile. This extended position exposes internal umbilical connectors to permit internal missile components to be connected to external sources of power (electrical, pneumatic, etc.). Gravitational forces during eject (launch) displace the nose cone rearwardly against the guidance section. The assembly controls impact velocity of the nose cone and guidance section during closure thereof. At closure, a smooth aerodynamic surface is formed at the junction of the nose cone and guidance section.

Abstract: The power meter provides an analog output voltage which is proportional to ower for both sine wave excitation and all other excitation types. The circuit of the meter involves the use of electronic multipliers to produce the low-ampere product of voltage and current in real time, and sums the results to produce the total power output representation for all phases.

Abstract: A periodically adjustable frequency generator having as the source of the equency signal a voltage controlled crystal oscillator. A power supply provides a continuous voltage to the oscillator which corresponds to the initial operating frequency. As a periodic error correction signal is received, it is fed through a delay circuit and then to a holding circuit which has an output equal to the last received input. The output of the holding circuit is summed with the power supply signal to provide a corrected voltage signal to the voltage controlled crystal oscillator.

Abstract: An optically fed lens array radar system is provided with an on boresight ed and a plurality of off boresight feeds. When looking far enough off boresight, one switches from the on boresight feed to the appropriate off boresight feed. The off boresight feeds simultaneously cover a large scan angle and achieve with the on boresight a large bandwidth over the largest scan angle of interest.

Abstract: The position of one pulse relative to a reference pulse is obtained by hag the one pulse set a string of flip-flops until the setting is inhibited by a stop signal generated by the second pulse. The condition of the flip-flops is read by an encoded network.