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- W190758235 abstract "The Bureau of Mines conducted in-mine tests to determine correction factors applicable to low-velocity airflows (below 150 fpm) measured by the smoke cloud, vane anemometer, and oil of wintergreen tracer gas techniques. The average correction factors found for these methods of measurement were lower than those reported in the literature for use with higher velocity measurements. All tests measured airflows with controlled average velocities ranging from 50 to 100 fpm. Correction factors averaged about 0.75 for readings taken by the centerline smoke cloud method, remotely controlled and stick-held centerline anemometer, and split traverse stick-held anemometer. For hand-held centerline anemometer and oil of wintergreen tracer gas readings, correction factors averaged about 0.67. Since special anemometers are needed to measure airflows in this low-velocity range, and since proper calibration of these anemometers is difficult and expensive, the use of anemometers for low-velocity measurement is impractical. On the other hand, smoke and oil of wintergreen give results as consistent as those obtained with specially calibrated, low-velocity anemometers. Furthermore, they are easy to use and inexpensive." @default.
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- W190758235 date "1979-01-01" @default.
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- W190758235 title "Correction factors for low-velocity airflow measurements in mines" @default.
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