Developed by a team headed by Dr. John Cotes in the mid-1960’s.  Performed spirometry, helium dilution FRC and single-breath DLCO.  Design was acquired by P.K. Morgan and was manufactured and sold in Britain in the early 1970’s.  From Inspire, 2018, Volume 19, No. 1, April as part of a memorial to Dr. Cotes.  Photo contributed by Kevin Hogben.