Height Finder Observer (692) Enlisted Personnel

Operates a large horizontal base stereoscopic range finder in the range section of a seacoast or antiaircraft artillery battery to determine distances in yards to fixed points, enemy seacraft, and enemy aircraft.
Supervises height finder team consisting of an azimuth tracking, elevation tracker, and reader. Prepares instrument for operation. Levels instrument, using spirit level. Sets off interpupilary distance between the lenses. Focuses eyepieces to accommodate own eyes. Determines correction factors for range, and calibrates the instrument by means of an adjusting dial. Operates instrument by sighting on the object. Determines distances by adjusting stereoscopic image so that object sighted appears at the same depth as the reticule scale within the optical system.
Must possess normal vision in both eyes with stereoacuity of not less than 80 percent.