2. After an ordinary inspiration empty the lungs as completely as possible into the spirometer, noting the quantity exhaled.
"Physiology and Hygiene for Secondary Schools"
Francis M. Walters, A.M.
3. Now fill the lungs to the full expansion of the chest and empty them as completely as possible into the spirometer, noting the amount expelled.
"Physiology and Hygiene for Secondary Schools"
Francis M. Walters, A.M.
In my own case, for instance, the spirometer should register, according to the table of comparative height and breathing power compiled by John Hutchinson, 230 cubic inches.
"The Mechanism of the Human Voice"
Emil Behnke