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Citation |
Ferree CE, Rand G. J. Exp. Psychol. 1920; 3(1): 59-71. |
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Copyright |
(Copyright © 1920, American Psychological Association) |
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DOI |
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PMID |
unavailable |
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Abstract |
Describes the design and application of an apparatus that was devised in response to a request by the Eye Division of the U. S. Naval Hospital for a means of making a quick and accurate test of acuity at low illumination. Experience has shown, roughly speaking, that only 25-30 per cent, of the men on the battleships have a sufficiently keen acuity at low illuminations to qualify for all branches of the lookout and signal service work. The apparatus provides for a wide range of illumination in just noticeably different steps (beginning at 0.07 meter-candle or lower), with no change in the color value of the light and with a specification at each step of the intensity of light falling on the test-object. (PsycINFO Database Record (c) 2012 APA, all rights reserved) |