Accession Number:

ADB220005

Title:

The Legibility of Type As a Function of Reflectance of Background under Low Illumination

Descriptive Note:

Corporate Author:

TUFTS UNIV MEDFORD MA

Report Date:

1952-06-01

Pagination or Media Count:

24.0

Abstract:

The legibility of lower case type as a function of illumination level, reflectance of background, and type size was measured by means of speed and accuracy scores on a letter cross out test. Simulated red cockpit illumination was used, covering the range from 0.014 to 0.129 foot-candles. Red light reflectance of background was varied from 0.26 to 0.87. Type sizes were 6 and 8 point. Scores fell off at an accelerated rate with decreasing illumination and background reflectance, and were lower under all conditions for 6 than for 8 point type. The specific application of these data to chart design will be covered in a subsequent report.

Subject Categories:

  • Anatomy and Physiology
  • Human Factors Engineering and Man Machine Systems

Distribution Statement:

APPROVED FOR PUBLIC RELEASE