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A laboratory for testing optical range finders constructed under the sponsorship of the Ordnance Department, U. S. Army is described. The central piece of the equipment, specially designed and constructed for the purpose, is a testing instrument that optically simulates targets at ranges from 855 yards to infinity, introducing the corresponding angular parallax between two beams of light at a separation of 15 feet, with angular errors not exceeding one second. This instrument is installed in a room with temperature control equipment and also provision for applying directed radiation to simulate extremes of temperature substantially as great as those encountered under service conditions. Such a laboratory provides convenient means of rapidly acquiring exact information regarding the behavior of a range finder and localization of the sources of error. It also enables one to predict how a given range finder will perform at any point on the earth's surface without the necessity of maintaining laboratories in the different temperature zones.