A large display system capable of displaying a video image receives video signals, quantizes those signals to produce a digital code capable of representing variations in the light content of the image and processes the digital code so as to control individual display devices on a large matrix of such devices to have different levels of visibility to thereby reproduce the video image for viewing by a large audience. A data processor is optionally utilized to store the digital representation of t...

An optical intensity adjustment device for adjusting the intensity of optical radiation incident thereon includes a first transparent conducting electrode, a second transparent conducting electrode, a layer of a twisted nematic liquid crystal material contained between the first electrode and the second electrode, an optical polarisation polariser located adjacent to the first electrode for linearly polarising optical radiation incident on the said layer, via the first electrode, an optical pola...

A portable high intensity lamp comprising of a housing having a lamp supported in it and also carrying a battery and a switch relay and circuitry to energize and de-energize the light source from the battery, and a remote control trigger device and connecting line to the circuitry within the housing arranged to be removably supported in the housing, means being provided to hold the trigger device in the housing during transport, the trigger having a test and also an energize switch to operate th...

A lighting appliance for use in dentistry or the like provides for varying the intensity of the light output while maintaining a substantially constant color temperature thereof. In the lighting appliance a light source, which includes a high intensity lamp located at the inner focus of an ellipsoidal reflector and a heat absorbing filter, is movably positioned with respect to a light gate and aspheric lens. At maximum light intensity output from the lighting appliance the light source is positi...

A light projecting apparatus consists of a concave, substantially prolate-spheroidal reflector having a major axis coincident with the optical axis of the apparatus and a metal halide high intensity discharge source positioned at a first focal point of the reflector and inclined with respect to the optical axis of the apparatus at an angle of approximately 30.degree..

A high intensity magnetic sorter in which a mixture of feebly magnetic particles and non-magnetic particles are fed to the top portion of a rotary wheel rotable about a horizontal axis and influenced by an intense magnetic field creating field gradients increasing radially toward the wheel for attracting the magnetic particles toward the wheel, and deflector plates for guiding the separated non-magnetic particles and magnetic particles from the rotating wheel to separate deposit stations.

A variable intensity fluorescent display, utilizing fluorescent segments for forming indicia when irradiated by an ultraviolet lamp, utilizes a separate source of infrared light, such as a variable intensity incandescent lamp and deep red, or infrared, filter and the like to provide quenching action in the fluorescent material in a controlled manner.

A laser beam intensity regulator is disclosed for independently regulating the relative intensities of the coaxial monochromatic beams eminating from a multi-wavelength laser. First, the monochromatic beams are spatially separated. Utilizing the shift of a dielectric mirror's pass band towards lower wavelengths as the angle of incident beam thereon increases, the regulator described herein includes a rotatable dielectric mirror placed in the path of the monochromatic beam to be regulated. The wa...

A gas discharge display device for exhibiting an analog value in a sealed envelope having a viewing window with a plurality of linear cathode segments arranged in succession to form a row or column capable of exhibiting a glow discharge. The cathodes are arranged in groups within the sealed envelope with a separate anode electrode in operative relationship with each of the groups of cathodes. Alternate ones of the anode electrodes are activated simultaneously in alternating sequence, so that the...

An apparatus for ablating tissue, the apparatus having first and second opposing jaws operative to compress tissue to be allayed therebetween, the first jaw having a first ablation surface directing ablative energy into the tissue and the second jaw having a second ablation surface reflecting incident ablative energy into the tissue. The ablative energy may be ultrasonic, microwave, cryoablation, radio-frequency, photodynamic, laser, and cautery energy. The instrument may also have a pointed tip...