Accession Number : AD0668260

Title :   EVALUATION OF POINTING TO A SHARP EDGE.

Descriptive Note : Technical rept. (Final), Mar 66-Dec 67,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF CIVIL ENGINEERING

Personal Author(s) : Colcord,J. E. ; Lund,Kenneth

Report Date : APR 1968

Pagination or Media Count : 72

Abstract : The report includes the design of an apparatus to measure the ability of observers to point on a sharp black white edge at a standard test distance of 6 meters to a least count of better than 0.1 second of arc. The parameters measured were the size of circular measuring marks, illumination, and occular openings. The results show the effect of these variables on the task, the optimum design parameters, and point out the wide variability in absolute observer performance in both tangent and center settings. The general results suggest a standard deviation of about 10 seconds of arc on the average at optimum conditions. (Author)

Descriptors :   (*PHOTOGRAMMETRY, MEASUREMENT), (*PHOTOINTERPRETERS, *VISUAL ACUITY), (*STEREOSCOPIC PROJECTORS, INDICATOR LIGHTS), PHOTOINTERPRETATION, PERFORMANCE(HUMAN), TARGETS, ILLUMINATION, ACCURACY, PSYCHOPHYSICS, COMPARATORS, STEREOSCOPES, STEREOSCOPIC MAP PLOTTERS, AERIAL PHOTOGRAPHS, PHOTOGRAPHIC INTELLIGENCE, STATISTICAL ANALYSIS

Subject Categories : Anatomy and Physiology
      Military Intelligence
      Human Factors Engineering & Man Machine System

Distribution Statement : APPROVED FOR PUBLIC RELEASE