A NEW METHOD FOR STUDYING BREATHING, WITH OBSERVATIONS UPON NORMAL AND ABNORMAL SUBJECTS

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Abstract
A new pneumotachographic device is described for making a graphic record of the velocity of air movement during inspiration and expiration. The inspiratory and the expiratory air currents cause the deflections of fine wires, deflections that are recorded photographically by a moving paper camera. Typical illustrations of the resulting curves are presented, showing the results on 1 normal individual and on 5 patients with respiratory difficulties. The total minute vol. and the instantaneous air flow can be obtained from the records made by the instrument.

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