Abstract: In a device for measuring and transmitting the combustion radiation in the combustion chamber of combustion engines, the combustion radiation in the movable part of the combustion engine is detected by means of optical sensors arranged therein and transmited through optical light guides to the fixed part of the engine. At the gap between the movable part and the fixed part an optical light guide emitting with its cross-section representative signals for the determined combustion radiation is arranged in the movable part, and on the fixed part opposite the gap an optical receiver is mounted for receiving and transmitting the received signals.

Abstract: A furnace tray for supporting tooth pegs used in the manufacture of false teeth, dental prostheses and the like comprises a refractory tray base member having a carbon plate receiving recess in its upper surface. A carbon plate is positioned in the recess and dental prostheses supported by tooth pegs are placed on the upper surface of the plate. The tray with the carbon plate and the dental prostheses thereon are then placed in a furnace and the teeth are fired. During the firing process the interior of the furnace is simultaneously purged by the carbon.