1850s, Gas meter, Spirometer Spirometer, Forstmann, 1854 November 29, 2014 Richard Johnston Leave a comment From Handbuch der speciellen Pathologie und Therapie, Volume 5, Part 1, by Rudolf Ludwig Karl Virchow. Published by F. Enke, 1854, page 106. Spirometer attributed to Franz Forstmann and is a wet (water sealed) gas meter.