| 摘要 |
A spirometer having an inflatable bellows 2, is provided with a movable member 15 which runs along a track 16. By adjusting parts 17, the configuration of the track is set locally to give a variable resistance to movement of member 15 and, consequently, inflation of the bellows 2. Calibration is achieved in a simple manner by adjusting parts 17 as the bellows is inflated progressively with measured amounts of air. Adjustments made correctly are not upset by adjustments made later in the calibration operation.
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