A U-tube manometer for measuring inspiratory and expiratory pressures. A variety of mouthpieces and masks used with it are shown. From “Real-encyclopedia of the Entire Obstetrics” , Volume 15, by Urban & Schwarzenberg , published 1888, page 657.
A U-tube manometer for measuring inspiratory and expiratory pressures. A variety of mouthpieces and masks used with it are shown. From “Real-encyclopedia of the Entire Obstetrics” , Volume 15, by Urban & Schwarzenberg , published 1888, page 657.