Abstract: An infrared temperature probe for high pressure use is in the form of a hollow bolt adapted to be threaded into a complementary threaded aperture in the wall of a pressure vessel with the end thereof disposed flush with the internal surface of the pressure vessel wall. An infrared transparent window is secured in the end of the hollow bolt with one surface thereof disposed flush with the end of the bolt. A bundle of optical fibers is secured within the opposite end of the hollow bolt and a glass rod is mounted within the hollow bolt in operative relation to the window and the optical fiber bundle for transmitting infrared radiation from the window to the optical fiber bundle. The interior of the hollow bolt may be supplied with a circulating cooling liquid or gas.

Abstract: A controller for a spot-welding machine compares the temperature evolution at a site at which a spot weld is being made to a standard thermal history stored in a digital read/write memory in controlling the welding current for the weld. Standard thermal histories can be generated and written into the memory as needed by an operator of the welding machine to take into account changes in operating conditions. The temperature evolution of the spot-welding operation is monitored by detecting radiant energy whose intensity provides a measure of a temperature of the weld. Phosphorescent radiation from a thermographic phosphor located in a welding tip of the welding machine and thermal infrared radiation are preferred for monitoring the temperature evolution of the spot-welding operation.

Abstract: A clock is provided having a luminous digital display. The clock is enclosed in a housing having a glass covered display face. A stationary light source is provided within the housing. The first end of each of a plurality of optical fiber light conductors are mounted in annular concentric bands on a mounting board inside of the clock. The second end of each of the optical fiber light conductors are arranged in a pattern on the display face to indicate time. The light guides receive light from the light source and cause illumination of the display. Filters are mounted on arms which are in turn rotatably attached to the output shafts of a clock motor. The arms are disposed in such position that the filters come between the light source and the first ends of a group of light conductors as the filters rotate, filtering the light received by that group of conductors, and creating a colored display of time information at the second ends.

Abstract: A clock is provided having a luminous digital display. The clock is enclosed in a housing having a glass covered display face. A stationary light source is provided within the housing. The first end of each of a plurality of optical fiber light conductors are mounted in annular concentric bands on a mounting board inside of the clock. The second end of each of the optical fiber light conductors are arranged in a pattern on the display face to indicate time. The light guides receive light from the light source and cause illumination of the display. Filters are mounted on arms which are in turn rotatably attached to the output shafts of a clock motor. The arms are disposed in such position that the filters come between the light source and the first ends of a group of light conductors as the filters rotate, filtering the light received by that group of conductors, and creating a colored display of time information at the second ends.A special arrangement of the light guides produces a simulated pendulum effect.