Engineering reminiscences contributed to "Power" and "American machinist" (1908)
Porter, Charles T. (Charles Talbot), 1826-1910 · New York, J. Wiley · leaf 417
d 21 inches in diameter,the stroke 24 inches, and the shaft made 180 revolutions per minute.The condenser presented a new design in one respect; the air-pumpwas double-acting and made only 45 double strokes per minute, be- 318 ENGIXEERIXG REMINISCENCES ing driven by a belt from the engine shaft and… … Atmosphere
