A recording spirometer, attributed to Goiffon. It appears to have been used to measure the hyperventilation from rebreathed air (response to CO2 test). It recorded respiration on a strip of paper. From La Presse Medicale, 1935, no. 36, page 716. Attributed to Goiffon, Parent et Waltz, Annals de Medicine, Mai et June 1934, “L’Insuflisance refelexe de la ventilation pulmonaire”.