. Carnegie Institution of Washington publication. brass rod is drawn into this opening, thus producing an air-tight closure. When in actual use during the process of weighing, a thin rubber diaphragm prevents leakage of air through this opening. The escape of heat through the weighing-tube is minimized by having this tube of hard rubber. VENTILATING AIR-CURRENT. The ventilating air-current is so adjusted that the air which leaves the chamber is caused to pass through purifiers, where the water-vapor and the carbon dioxide are removed, and then, after being replenished with fresh oxygen, it is
. Carnegie Institution of Washington publication. brass rod is drawn into this opening, thus producing an air-tight closure. When in actual use during the process of weighing, a thin rubber diaphragm prevents leakage of air through this opening. The escape of heat through the weighing-tube is minimized by having this tube of hard rubber. VENTILATING AIR-CURRENT. The ventilating air-current is so adjusted that the air which leaves the chamber is caused to pass through purifiers, where the water-vapor and the carbon dioxide are removed, and then, after being replenished with fresh oxygen, it is returned to the chamber ready for use. The general scheme of the respi- ration apparatus is shown in fig. 27. The air leaving the chamber contains carbon di- oxide and water-vapor and the original amount of nitro- gen and is somewhat deficient in oxygen. In order to pur- ify the air it must be passed through absorbents for car- bonic acid and water-vapor and hence some pressure is necessary to force the gas through these purifying ves- sels. This pressure is ob- tained by a small positive rotary blower, which has been described previously in de- tail.* The air is thus forced successively through sulphu- ric acid, soda or potash lime, and again sulphuric acid. Finally it is directed back to the respiration chamber free from carbon dioxide and water and deficient in oxygen. Pure oxygen is admitted to the chamber to make up the deficiency, and the air thus regenerated is breathed again by the H2O ABSORBED CO, ABSORBED H2O ABSORBED FIG. 27.—Diagram of ventilation of respiration calorimeter. The air is taken out at lower right-hand corner and forced by the blower through the apparatus for absorb- ing water and carbon dioxide. It returns to the calo- rimeter at the top. Oxygen can be introduced into the chamber itself as need is shown by the tension equalizer. BLOWER. The rotary blower used in these experiments for maintaining the venti- lating current of air has given th
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