1960s, Photograph, Spirometer Spirometer, McKesson Vitalor, 1961 February 7, 2014 Richard Johnston Leave a comment From: JAMA, 1961 Sep 23. Volume 177, page 865. A dry wedge bellows spirometer. A pen attached to the lid of the bellows wrote on a small sheet of graph paper that was driven horizontally by an electric motor during exhalation.