Abstract: A contact lens has a transmission hologram which provides diffractive power on a wavelength and/or amplitude selective basis whereby light from near and distant objects can be focussed on the retina of a presbyopic wearer. Similarly an implant lens can have a transmission hologram to correct for non-accommodative vision. The invention is particularly useful in providing an artificial eye lens with a bi-focal action without need for distinct near and far vision zones.

Abstract: An ophthalmic lens incorporates a transmission hologram which has negative diffractive power and introduces positive longitudinal chromatic aberration to add to the natural longitudinal chromatic aberration of the human eye, thereby reducing the need to accommodate. The lens also has refractive power to balance the diffractive power or to give a desired overall or residual power.

Abstract: A bifocal contact lens has diffractive power added to the basic refractive power provided by the material of the lens and the basic curvature of its front and rear surfaces. The diffractive power arises from concentric zones, each providing an asymmetric retardation of light across the zone width to direct design wavelength light predominantly into a required order and sign of diffraction, while other wavelength light is predominantly transmitted at zero order. Design wavelength light from an object at one distance can then be focused by way of diffraction of that order and sign, and other wavelength light from an object at another distance can be focused by way of zero order transmission. Preferably the zones are defined, and the asymmetric retardation provided, by a rear surface contour having steps but which approximates to the required basic curvature.

Abstract: An eyeguard for a low light level or night vision rifle sight which does not rely on uniform axial pressure for proper opening comprises a moulded rubber body having a front portion which fits on the viewing end of the sight, a back cup portion angled with respect to the front portion, and a middle thin walled deformable portion to which a single flap is secured. The flap is biased towards a closed position by the resilience of the body but is opened by angular pressure applied by an observer's eye socket to the cup portion.

Abstract: To facilitate the refilling of a fluid toner into a toner container of a printing of copying device, a toner refill container (16) is used which has a nozzle (20), whose opening is sealed by a foil (5), which can be removed from the nozzle edge (7) by a tear-open or tear-off cord (6) after a coupling ring (17) of the toner refill container (16) has been inserted into the filler neck (22) of a toner container (23). Moreover, the tear-open or tear-off cord (6) is led from the inside of the toner container (23) through a guide channel (18) to the outside.

Abstract: In a connecting device for components to a belt (14), a belt connection (7) mounted rotatably in the device is used, which is connected integrally in rotation to a ratchet wheel (9) which exhibits only one tooth (10) with which a detent pawl (11) is associated. The belt (14) can be connected rapidly and safely to the device by rotating the belt connection (7).

Abstract: A lighting fixture which may be installed under a shelf or cabinet positioned above a working area or positioned above any area in which illumination is sought. The lighting fixture is capable of easily and effectively directing the light to specific locations within the working area. A florescent tube is disposed along the length of the fixture. It has a reflector located above it. Below the florescent tube there is an elongated perforated metal panel covering approximately one-third of the light opening below the tube. The panel may be moved transverse to the length of the tube along the opening to direct the light from the tube. The panel is preferably formed of one fixed and one identical overlapping, movable, perforated metal panel. The movable panel may be moved parallel to the length of the tube to control the amount of light passing through the panels. The fixture is provided with cord storage in the middle of the back of the fixture. The ballast is mounted via a closed cell foam pad.

Abstract: Monoclinic phosphorus is produced in a single source vapor transport apparatus comprising a sealed evacuated ampoule containing a mixture or compound of phosphorus and an alkali metal with the phosphorus to alkali metal ratio being 11 or greater. The charge is heated to 550.degree.-560.degree. C. and the monoclinic phosphorus crystals are formed on the cooler surface at the top of the ampoule over the temperature range of 500.degree.-560.degree. C. The preferred heating temperature is in the neighborhood of 555.degree. C. and the preferred deposition temperature is in the neighborhood of 539.degree. C. Alkali metals that may be employed include sodium, potassium, rubidium and cesium. The monoclinic phosphorus crystals form in two habits. Those formed in the presence of sodium and cesium are in the form of flat square platelets up to 4 mm on a side and 2 mm thick. These platelets may be easily cleaved into thinner platelets, like mica.

Abstract: To facilitate correct orientation of a solar cell cover to locate its coated face away from the solar cell member with which it is assembled, its other face is provided with an orientation indicative surface relief mark which becomes invisible when the cover is secured to the member by an adhesive of matching refractive index.

Abstract: In facilities having several systems of circulating shelving, because of the multiplicity of parts to be stored the regular use of a data processing system is required. For controlling the systems of circulating shelving by means of the data processing system, suitable control arrangements are used. In such a control arrangement, the signal output (51) of a data station (33) is coupled via an optical coupler (62) to a transmit line (38). The transmit line (38) connects in parallel all similar connections of the data stations of several control arrangements, allowing the interposition of a multiplexer to be dispensed with.

Abstract: Liquid white phosphorus is distilled from red phosphorus in vacuo at 480.degree.-490.degree. C. The vapor is transferred in a conduit maintained at 250.degree. C. and condensed into liquid white phosphorus at room temperature. The liquid white phosphorus is then filtered to eliminate any condensed red phosphorus. The clear, colorless phosphorus produced may be utilized as a source of P.sub.4 species for chemical vapor deposition, sputtering, vacuum deposition, and molecular beam deposition of phosphorus, polyphosphide, and other phosphorus compound films for semiconductor and other applications including insulation and passivation.

Abstract: The fastening device has a head portion with a uniform cross section, the uniform cross section having a plurality of non-uniform indentations. A matching socket wrench is provided having an internal cross section matching the exterior cross section of the fastening for tightening or loosening the fastening. The invention is particularly useful for preventing unauthorized removal of automobile wheels.

Abstract: The present invention provides a trap for a vapor species, particularly a pnictide.sub.4 vapor species, for a vacuum system of the type including a vacuum chamber communicating with a forepump through a vacuum line. The trap may be positioned within the vacuum chamber itself, or in the alternative, the trap may be located between the vacuum chamber and the forepump. The trap includes a housing for a cracker, which may be a heated filament or a plasma, which cracks the pnictide vapor species into pnictide.sub.2. The walls of the housing are cooled so that the trapped pnictide species readily forms a film and adheres to the walls of the housing. The pnictide.sub.4 vapor species, which may be harmful to the operation of a forepump, is prevented from entering the forepump. A removable sleeve can be positioned in the housing so that the cracked species adheres to it. The sleeve may be removed from the housing for maintenance and replacement purposes.

Abstract: An `eye-piece` system for a non-Galilean afocal infra-red telescope designed to contribute to astigmatism correction, pupil match, and true afocality without undue increase in objective aperture requirements comprises a positively powered back group and a negatively powered front group consisting of a rear lens element with a convex rear surface and a front lens element with a concave front surface, there being a negatively powered gas lens between the rear and front elements of the front group. The objective system may be catadioptric.

Abstract: An interface computer having an RS232 port for connection to a host computer. The recorder is connected to the interface computer by a control cable providing more lines than required. The source provides a control signal on another line. This control signal is provided every frame or twice per frame, i.e., every field. Two tables identifying the control lines are stored. The user selects the type of equipment to be utilized and the table appropriate to most of such equipment is transferred to the random access memory of the interface computer. Frame identifying data is recorded periodically on one of the audio channels of the video equipment. When the host computer desires the video player to skip to a particular frame and number, the interface runs the video equipment to a stopping range of frames before the desired frame and then stops the video equipment. The video equipment will overshoot in rewind and fast forward and the overshoot varies depending on tape position.

Abstract: Fine quality catenated phosphorus thin films are produced in a high vacuum evaporator. Heated tungsten wire crackers are provided above the phosphorus boat and below the substrates. Amorphous pure phosphorus shiny red films have been deposited on glass, metallized glass and GaP and exhibit an optical edge at 2.0 eV. Films of KP.sub.x where x is equal to 15 or greater than 15 are produced by utilizing a second baffled boat source containing the potassium graphite intercalate, KC.sub.8. Addition of a nickel evaporation source provides nickel-doped polyphosphide films.

Abstract: A multi-drop local area network utilizes alternating current power lines as a transmission channel. Identical transceivers are used as a master and as up to 255 slaves. Each transceiver comprises modulator and demodulator units and a microprocessor control unit which may be connected to a host. The modulator and demodulator are connected to the alternating current power line through a high pass filter comprising a split bobbin, iron core transformer having an air gap which also provides impedance matching. The demodulator includes a clipper and analog circuitry providing a band pass filter and generating a square wave corresponding to the received carrier. A state machine acting as a digital filter produces a received carrier signal only when each half cycle of the carrier square wave is of the proper duration and the carrier signal has existed for slightly more than one half of the transmitted bit duration, which is a predetermined number of carrier cycles.

Abstract: Polycrystalline and monocrystalline potassium polyphosphide, KP.sub.15, has been grown from the liquid phase at a temperature range of 600.degree.-700.degree. C. Massive crystallization of KP.sub.15 whiskers and platelets is observed. Crystalline KP.sub.15 films have been grown on gallium arsenide (110) and gallium phosphide (111) polished wafers, silicon (110) polished wafers, quartz, on a nickel evaporated 2000 angstrom nickel layer on quartz, and on nickel foil. Microcrystalline KP.sub.15 formed by a condensed phase process is incorporated into a sealed ampule evacuate 10.sup.-4 torr. The temperature is raised to 655.degree. C. and the furnace tilted to bring the melt in contact with the substrates. The temperature is then reduced to 640.degree. C. and the furnace is tilted back to the original position. Large KP.sub.15 whiskers several millimeters in size are grown from the melt and crystalline films of KP.sub.15 are grown topotaxially on gallium arsenide and gallium phosphide.

Abstract: Master units and slave units are preferably housed in identical housings. Each master unit comprises a Central Intelligence Unit (CIU) which in turn comprises a drum processor and a communications processor, and an Input/Output Unit (IOU) having input terminals and relays for connection to external devices. Each slave unit comprises an IOU. Each IOU is connected to its CIU through a Local bus (L-bus). Up to sixteen IOU's may be controlled by a single CIU.Up to 16 master units may be connected together by means of console bus (C-bus) and a data exchange bus (X-bus), in which case each master unit is given control of specified "X" variables for update. Each "X" variable has a specific time slot on the X-bus and all "X" variables are stored on an X-drum at each master unit.The C-bus may be connected to a computer terminal at each master for programming of all CIU's, or to computer devices, or to long distance communication lines.