60-80

Updated: May 9, 2025

Steam-driven air compressors are usually run at a piston speed of about 350 feet per minute, or from 60-80 revolutions per minute of compressors of average sizes, say 18" diameter of cylinder. Sixty revolutions per minute is equal to 120 strokes, or two strokes per second.

Various - Scientific American Supplement, No. 799, April 25, 1891