A distance indicating lens system mounted on the rear of a motor vehicle to give a visual warning to automobiles following behind. The visual signal being a projected light whose viewable color changes as the vehicle following approaches the advance vehicle.

Waterproof navigation light comprising a fluorescent lighting unit embedded in a clear or colored transparent or translucent plastic.

A surgical light of a type adapted to be worn on the head of a user, including a harness element, a fiber optic light carrier element, and a light projecting element carried by said harness element, said harness element having frictional retaining means thereon engaging said light carrier element at a plurality of points therealong, said light projecting element forming a socket, a free end of said light carrier element being maintained in tensionless condition within said socket in the absence ...

An improved light pen including an actuator switch which is affixed to the body of the light pen at an acute angle to its longitudinal axis.

A dental illuminator projecting a sharply defined beam of light and having an optical clad glass rod for providing in addition a supplementary small spot of light for illuminating cavities and the like. The glass rod is placed with one end near and facing said bulb and perpendicular to the axis of the filament to receive light directly therefrom. The rod extends outside said fixture, and is connected to a flexible fiber optic conduit.

In a light unit that includes a plurality of sockets for receiving bulbs therein, and wherein there is provided a means for connecting the light unit to a source of supply of electrical energy.

For dental, medical and other uses, with a disclosant phosphor-dye such as sodium fluorescein, a disclosing light emitting radiation substantially confined to the wavelength range between 380 and 505 nanometers (nm.) and free from infrared, yellow and ultraviolet. The light includes a source of light, which can be an incandescent lamp, a dichroic reflector behind it to reflect blue light forwardly and transmit the rest backwardly, a dichroic filter in front of the lamp to transmit blue light and...

Microchannel plates prepared from anodized aluminum layers etched to increase the pore volume to approximately 50 percent and then treated to exhibit suitable electrical properties for use as a channel plate.

A lighting device for viewing calculus, (plaque), tartar, and the like on a person's teeth, the device utilizing a fluorescent lamp with a phosphor such as calcium strontium magnesium silicate, activated by europium, to emit light mainly in the 400 to 520 nanometers wavelength region, that is in the blue and green region, but not the yellow, to produce a yellow fluorescent emission from any calculus or tartar on the teeth. The teeth are first treated with a fluorescent material such as a weak so...

Shade for a light consisting of laminar elements which are individually bent and arranged in a plurality of parallel rows. Each element is provided with hook-like projections at both opposite lateral edges and recesses displaced in relation to the hook-like projections. Each of the plurality of adjacent rows consisting of the elements is offset to a preceding row thus forming a three-dimensional shade body.