Noise Suppression on Rock Drills

CIM Bulletin1963
For many years, it has been known that certain loud noises may, with prolonged exposure, temporarily or permanently damage a person's hearing ability. Pneumatic rock drills, although among the offenders, have, until recently, remained unaltered and unrestricted as to noise output. Now, there are drills available with higher rates of penetration and yet with noise levels reduced to those of previous models or less. Use of such drills, when proved to be superior in noise attenuation and of acceptable performance, should be encouraged in order to reduce future hearing losses to a minimum.
Keywords: decibels, Galt, Ontario, hearing loss, industrial noise, Drill, Drills, Exhausts, Frequency, Noise, Operators, Pressure, Reduction, Rock drills, sound
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