Found at Zeepreventorium.org. Described as a Mijnhardt spirometer from the 1960’s. Appears to be a water-seal spirometer. Kymograph paper appears to be stretched across two rollers.
Found at Zeepreventorium.org. Described as a Mijnhardt spirometer from the 1960’s. Appears to be a water-seal spirometer. Kymograph paper appears to be stretched across two rollers.