Abstract: A method for providing an image of zones of ultraviolet absorbing material in a medium substantially transparent to ultraviolet light, such as nucleic acid in a polyacrylamide gel, comprises the steps of placing in juxtaposition to the gel standard photographic film and directing ultraviolet light to the gel such that the photographic film is in the path of light exiting the gel. The zones in the gel absorb one or more discrete wavelengths of ultraviolet light, and the film is exposed by incident ultraviolet light such that a photographic image of the nucleic acid zones is created on the photographic film. Apparatus for providing ultraviolet images of ultraviolet light absorbing material in a medium relatively transparent to ultraviolet light comprises an enclosure in which a medium with zones of ultraviolet light absorbing material is placed.

Abstract: A system for impact welding using an electrical coil producing a magnetic field of sufficiently high-intensity to impel a ballistic workpiece into a separate stationary workpiece for producing a weld therein. The pressure on the ballistic workpiece resulting from the magnetic repulsion between the ballistic workpiece and the coil results in the ballistic workpiece being propelled towards the stationary workpiece at sufficient velocity to form a weld. Parameters are provided for varying the voltage and inductance of the capacitor bank for particular driving coil and ballistic workpiece dimensions to obtain matching of the impedances of the capacitor and coil arrangement to the particular ballistic workpiece. The impedance matching maximizes the conversion of electrical energy in the bank to kinetic energy of the workpiece.

Abstract: A machine for densifying and pelletizing extrudable material is disclosed. The machine includes, in combination, a flat horizontal die plate and pressure exerting means overlying the die plate, the pressure exerting means having various, alternative forms such as a continuous chain means carrying a plurality of spaced pressure members or a reciprocating frame carrying roller means.

Abstract: A system and method using magnetic pressure to propel a ballistic workpiece onto a stationary workpiece at sufficient velocity to produce a weld. Electrical power capacitors are connected to an electromagnetic coil which is positioned adjacent a ballistic workpiece which is propelled by pressures of magnetic force between the ballistic workpiece and the coil onto the adjacent stationary workpiece at sufficient velocity to form a weld.

Abstract: A rear-facing crashworthy set for fixed wing aircraft comprises a seat facing in the opposite direction to the direction of flight of the aircraft and energy absorbers attached between the seat and the floor of the aircraft. The energy absorbers include forward energy absorbers attached to a forward section of the seat, intermediate energy absorbers attached rearwardly of the forward energy absorbers, and rearward energy absorbers attached rearwardly of the intermediate energy absorbers, all energy absorbers having the capability of operating in both tension and compression. Stabilizing members are attached between the seat and the floor of the aircraft. Energy attendant upon a crash is absorbed, and the seat is enabled to flex with crash-induced distortions of the floor to prevent separation of the seat therefrom, thus preventing severe injury or death as a result of a second impact of the detached seat with a structural member of the aircraft, such as a bulkhead, under crash conditions.

Abstract: A crashworthy vehicle seat comprises a seat bucket member suspended by supporting webs engaged with rotary energy absorbers attached to the overhead of the vehicle. Beneath the seat bucket member, pairs of extensible and compressible energy absorbers are attached between the seat bucket member and the floor of the vehicle. Upon impact, the rotary energy absorbers and the extensible and compressible energy absorbers are arrayed to permit controlled and energy absorbing movement to reduce the probability of injury to the occupant of the seat. In the one form of the seat it accommodates itself to fore and aft forces acting upon it. In a modified form of the seat the design is optimized to accommodate these forces. In further forms of the seat the design is arranged for a sideward or lateral facing seat and the design is optimized to accommodate lateral forces.

Abstract: A snail protective barrier device. A band is provided of relatively thin foil material. Spaced slits are formed in its edges and flaps or webs are bent out horizontally from the strip of material to be in spaced relation relative to each other. The band with the horizontally extending flaps may be utilized in a straight line position; or in a circular, square or other configuration. Climbing insects, particularly snails, are prevented from passing the barrier by being unable to traverse the horizontal surfaces of the extending flaps or webs, particularly the underside surfaces.

Abstract: A spring driven power device in which energy in a loaded spring is delivered to a rotary member. A hollow cylindrical member having a splined inside surface is provided. A stem with external splines is coaxially mounted within the hollow cylindrical member with a space between the members. A viscous material such as silicon putty is disposed in the annular space between the members. A driving spring is provided which can be a coil tension spring with connections from the spring to one of the members, preferably the hollow cylindrical member. Relative rotation between the members is resisted by the viscous material. The spring releases its energy driving the hollow cylindrical member in a manner such that the energy is released in a steady controlled manner.

Abstract: The filter assembly for swinging bucket type centrifuges includes a cylindrical filter body disposed within a filter body holder, both having hemispherical outer ends. The diameter of curvature of the filter body is smaller than the diameter of curvature of the holder allowing the contact surface between the holder and the body to be in the shape of a ring; centrifugal forces thus result in compression of the filter body thereby preventing cracking. The filter's crenelated shape is provided through use of a plunger to apply force to the filter against the crenelated filter membrane forming member. The filter assembly also may have a chamber and a meniscus equalizing pore around the filter holder. The chamber and appropriately positioned pore prevent fluid from rising during centrifugation and contaminating the particulate.

Abstract: A lightweight hand-operated aircraft tug for small aircraft includes a main frame upon which a drive drum is movably mounted for engagement with the wheel of an aircraft. A reversible pawl and rachet or an equivalent device controls the direction of rotation of the drum. A lever arm controls the engagement and disengagement of the drum with the aircraft wheel. A pair of axle-engaging inserts are associated with the main frame of the tug so as to be engageable with the axle of the aircraft when the drum is driven into engagement with the wheel by the operation of the lever arm.

Abstract: A conversion kit having the necessary parts for purposes of mounting a radio or similar accessory in the cavity in the dash board of various automobiles. A mounting frame is provided having a front panel to which the radio or other accessory can be attached. The mounting frame is provided with brackets and openings or slots in both sides or the top and the ends whereby brackets can be adjusted into desired positions so that the mounting will accommodate to whatever mounting facilities or mounting holes are available in the cavity so that the mounting frame and mounting panel can accommodate to different cavities with the front panel in a substantially flush position with respect to the trim panel.

Abstract: A table or platform with an improved conductive top adapted for use particularly with small electronic parts. The table or platform includes a normally horizontal top surface. An improvement in one form of the invention is provided by way of stretching a metal screen or mesh material across the top and then filling the mesh with a layer of resin. The resin is ground or sanded off to expose the mesh to provide the conductive top. The conductive top is grounded. Appropriate grounding means are provided to accommodate the grounding. In a second form of the invention the conductive top is provided by way of embedment of metal particles in a plastic layer so as to make the layer conductive. Preferably the table or platform is fabricated by an improved method embodying the placement of plural layers of resin embedding the wire mesh material, screeding, sanding, and polishing to provide a smooth surface wherein the metal of the mesh is exposed.

Abstract: A seat for sailboats movable between an inboard position and an outboard position which is outboard of a gunwale. The appurtenance is constructed by way of a tubular frame with a fabric member attached to the frame by lacings. The frame has a C-shaped configuration with curved or generally L-shaped legs whose ends are hinged to brackets inside the boat spaced below the gunwale with a seat part which comes flush against the bottom of the boat in the inboard stowed position of the appurtenance.