. A practical treatise on medical diagnosis for students and physicians . Warrens conformator. The shape of the parts of the chest may be estimated by means of theconformator. AVarrens conformator consists of two hard-rubber or metalbraces which have been grooved to receive a number of blunt-pointed 478 PHYSICAL DIAGNOSIS OF DISEASES OF THE LUNG. needles. These needles move up and down easily and when applied toan undulating surface will conform to that surface, preserving the exactshape of the depressions and elevations. (Fig. 149.) Spirometry. The object of spirometry is to ascertain the res
. A practical treatise on medical diagnosis for students and physicians . Warrens conformator. The shape of the parts of the chest may be estimated by means of theconformator. AVarrens conformator consists of two hard-rubber or metalbraces which have been grooved to receive a number of blunt-pointed 478 PHYSICAL DIAGNOSIS OF DISEASES OF THE LUNG. needles. These needles move up and down easily and when applied toan undulating surface will conform to that surface, preserving the exactshape of the depressions and elevations. (Fig. 149.) Spirometry. The object of spirometry is to ascertain the respiratoryor vital capacity of the lung, the quantity of air taken in with each in-spiration and discharged with each expiration. The estimation is madeby means of the spirometer. Hutchinsons spirometer is constructed onthe gasometer principle ; Barnes is much simpler. The data ascertained Fig. Barnes spirometer. are not of much diagnostic significance. If measurements are made fromday to day in a lung which was incapacitated, we may be able to estimatethe extent of recovery from disease. When there is an important dimi-nution of lung-capacity, tuberculosis may be suspected even before sub-jective and objective signs warrant a diagnosis. We can estimate the degreeof interference with breathing caused by disease below the is of particular value because it shows in a graphic mannerthe need for respiratory gymnastics. Table III.—Comparison of the vital^ or lung capacity and the amount of airexpelled after an ordinary quiet respiration. (Average of E. O. Otis, 150 measurements.) Cubic inches. Vital capacity or the amount of air exhaled after a full inspiration . Amount of air exhaled after an ordinary quiet respiration Difference of complemental or reserve air Difference as given by Hermann 9-o PALPATION OF THE CHEST 479 Height. 66 to 6
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