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Legibility of Leroy Digits as a Function of Size, Distance, Angle of View, and Illumination Level

P. J. FoleyDefence Research Medical Laboratories (Canada)D. M. Scott

出版	Defense Research Board, Department of National Defense, 1957
URL	http://books.google.com.hk/books?id=3oTtswEACAAJ&hl=&source=gbs_api

註釋"A study was made of the legibility of twelve sizes of digits drawn using the Leroy Standard Gothic Lettering Guides. Digit sizes ranged from .06 inches to .5 inches in height. Five viewing distances were used, 2, 4, 8, 16, and 32 feet; three viewing angles at each distance, 45° right, normal, and 45° left; three conditions of illumination, 1, 10, and 50 foot-candles. Results are presented showing per cent of the population reading each digit size with one hundred per cent accuracy, at each viewing distance, from each viewing angle, and under each illumination level."--Abstract