To foretell a student’s probable flying ability, an “aviation aptitude tester” is used by the U. S. Navy. With it the prospective pilot’s ability to do two things at once, his general reaction time,q color blindness, angle of vision fatigue, and other characteristics are tested accurately in three minutes. The device, invented by Lieutenant Commander Henry W. Wickes, U.S.N.R., stationed at the Naval Reserve Base at Floyd Bennett Field, requires the subject to keep both hands busy. As six lights mounted on the panel flash on individually in red or green, the student is required to press the correct black buttons with his left hand to put them out. With his right hand he must keep the pointer in the center of the dial at his right whenever it moves off.