1970s, Helium Dilution FRC, Photograph Lung Volumes, 1974, Collins April 13, 2014 Richard Johnston Leave a comment From the Salina Journal, Salina, Kansas, Feb 10, 1974, page 8. A Collins Respirometer with a helium analyzer for measuring lung volumes. Publicity photo, note that the mouthpiece is outside the girl’s mouth, not a recommended approach.