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Development of Minimum Luminance Requirements for Underground Coal Mining Tasks.

Hitchcock LC

NTIS: PB/230-477 Available for Reference At Bureau Libraries :275 pages

10001344

The objective of this program was to determine the minimum luminance requirements for underground coal mining work from the working face to the first transfer point. The measurements necessary to produce usable data involved two distinct phases, the first being in-mine measurements. The second phase of measurements were made in a full- scale simulated mine work space with full-scale machinery models. The threshold visibility luminances were revised upward to encompass a 99-percent probability of detecting a dynamic visual task of varying location and further upward to encompass 95 percent of a 55- to 65-year-old population. Extensive reflectance measurements were made of coal surfaces, roof shales, and floor materials. The results will be useful in designing future luminaries and illumination systems.

19730101

CP; Final Contract Report;

1973

PB-230477

A13

OFR 12-74

PRC;

NTIS: PB/230-477; Available for Reference At Bureau Libraries

U.S. Navy