REFERENCES
- AUSTUN , T. K. , and SLEIGHT , K. B. , 1952 a, Accuracy of tactual discrimination of letters, numerals, and geometric forms . J. exp, Psychol ., 43 , 239 – 247 1952 b, Factors related to speed and accuracy of tactual discrimination. Ibid., 44, 287
- BROWN , F. K. , 1953 , A study of the requirements for letters, numbers, and markings to be used on trans–illuminated aircraft control panels. Purl 4. Legibility of uniform stroke capital letters as determined by size and height to width ratio and as compared to Garamond Bold . Naval Air Material Center, Aeronautical Medical Equipment Laboratory , Report TED No. NAM EL–690, part 4, March 10, 1953 .