1950s, Photograph, Spirometer Knipping Spirometer, 1950’s May 26, 2013 Richard Johnston Leave a comment Knipping Spirometer, circa 1950’s. Found in an on-line brochure for the Museum of the Department of Physiology, Colombo Medical School. Authors Dr. A.K. Vidanapathirana, Dr. P.M. Attapattu, Ms. Nadeetha keragala.