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Forward versus backward shift : Perspectives. Proc Human Factors Soc 33rd Ann Meeting, Denver, Colorado, 16–20 Oct 1989. Human Factors Soc, Santa Monica, Cal, Vol 2, 1989, pp 806–810, 13 refs rotation

✍ Scribed by J. Duchon; J. Wagner; C. Keran

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
278 KB
Volume
22
Category
Article
ISSN
0003-6870

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✦ Synopsis

Used lamps were still in service which only give off 2/3 to 1/4 of the illumination produced by new lamps. Rockface reflectance averages only 9-22% and therefore miners use their lamps set for narrow beam illumination, in order to obtain high enough luminances. However, this also produces luminance ratiosas high as 350: I between the centre of the visual field and its immediate periphery. This value is 100 times more than the maximum level recommended to avoid glare. Change to more powerful lamps illuminating a larger part of the visual field has to be encouraged. Resistance to such a change can be expected, since it seems this would necessitate that miners change their visual exploration strategies, which is bothersome and time consuming in the short term. This aspect of the problem deserves future research.

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