Physical and natural therapeutics : the remedial uses of atmospheric pressure, climate, heat and cold, hydrotherapeutic measures, mineral waters, and electricity / by Georges Hayem; ed. by Hobart Amory Hare.

  • Hayem, G. (Georges), 1841-1935.
Date:
1895
Catalogue details

Licence: Public Domain Mark

Credit: Physical and natural therapeutics : the remedial uses of atmospheric pressure, climate, heat and cold, hydrotherapeutic measures, mineral waters, and electricity / by Georges Hayem; ed. by Hobart Amory Hare. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    measured. Index needles serve to mark the diminution and the increase in pressure. (Fig. 3.) If the inspiratory force is to be determined, the needle is placed on the side marked inspiration, and with it also one of the maximal needles. Then, having made a strong expiration, the person applies the lips hermetically against the mouthpiece and takes the deepest inspiration possible. The index needle is displaced, carrying the maximal needle with it; the latter remains at the extreme point, but the former quickly rebounds. The number of degrees indicated by Fig. 3. Marchal's Pneumotometer. the maximal needle corresponds to the pressure in centimetres of mercury. To measure expiration the stopcocks are reversed, and the needle, carrying a maximal needle with it, is placed on the corresponding side. The subject after taking the strongest possible inspiration ex- pires forcibly, and the second maximal needle indicates the result of the effort. With all forms of apparatus errors are possible; it is important, therefore, always to use the same instruments and to employ them under identical conditions in order to obtain results that are com- parable.