Abstract: A radiant thermometer for detecting infrared rays coming from an object along an optical axis to determine its temperature is provided with an improved aiming system. An exterior housing supports an interior housing that mounts the detector having an opening for receiving the infrared rays. A visible sighting light source is provided in the exterior housing behind the detector. A peripheral lens system is mounted between the interior and the exterior housing to provide a cone shaped transmission of light having a larger field angle than a field angle of the detector. The cone shaped transmission of light is capable of being focused on the optical axis for aiming the radiant thermometer.

Abstract: A combustion safety apparatus wherein combustion exhaust gas of a burner is arranged to be introduced into a detecting tube having a tubular oxygen concentration cell element, and a safety valve is arranged to be controlled in operation by the output of the cell element. The detecting tube is in communication at its outlet opening with a mixing tube of the foregoing burner or another burner.

Abstract: This invention relates to an infrared radiation gas burner plate of the type that a plate member composed chiefly of ceramic is provided with a large number of distributed burner holes therethrough.

Abstract: The present invention relates to an apparatus for continuously measuring the concentration of oil in a water sample by the infra-red absorption method. The apparatus comprises a supplying device which supplies an oil-containing water sample and a supplying device which supplies a solvent for extracting the oil in the sample, each of said water sample and solvent being supplied in a controlled and continuous amount, an extractor connected to said supplying device having an agitator therein, which extractor receives said oil-containing water sample and solvent and serves to extract the oil component in the water sample with the solvent.