Found at www.egms.de. Subject is wearing a special mask developed for exercise testing. Photo taken at the Sports University of Cologne, 1949. Spirometer is likely a closed-circuit Dargatz Knipping spirometer.
Found at www.egms.de. Subject is wearing a special mask developed for exercise testing. Photo taken at the Sports University of Cologne, 1949. Spirometer is likely a closed-circuit Dargatz Knipping spirometer.