. Carnegie Institution of Washington publication. THE RESPIRATION APPARATUS. The blower consists of a cylinder A, perforated laterally by the open- ings a and b for the entrance and exit of the air current. Inside the cylinder and arranged eccentrically with it is a revolving drum B, bearing on its axis the rod F which carries at each end a piston, G and Gl. The piston G has a tight connection with the rod, while G1 is cushioned on the springs H. As the drum B is revolved the rod slides so that the pistons press against the inner face of the cylinder and prevent a backward escape of air, and t
. Carnegie Institution of Washington publication. THE RESPIRATION APPARATUS. The blower consists of a cylinder A, perforated laterally by the open- ings a and b for the entrance and exit of the air current. Inside the cylinder and arranged eccentrically with it is a revolving drum B, bearing on its axis the rod F which carries at each end a piston, G and Gl. The piston G has a tight connection with the rod, while G1 is cushioned on the springs H. As the drum B is revolved the rod slides so that the pistons press against the inner face of the cylinder and prevent a backward escape of air, and the current entering through a is forced out through b into the absorber system. The box in which the blower is placed is made of cast iron and provided with stuffing-boxes through which the shaft or axis of the revolving drum B and the pipes a and b pass. Any leakage of air in the blower is instantly detected by the bubbles of air in the thick cylinder oil. The shaft is oiled by unscrewing two long rods, which are tapped into oil-holes on each side of the blower. Leather washers on the rods insure tightness when screwed down. To avoid es- cape of air the blower is oiled j_ only when at rest. In order that no oil may be drawn into the absorbing FIG. 9.—Rotary Blower. Air enters at a, is forced about • j j the Drum B by Sliding Pistons G and G1, and is driven system a trap is provided, as outatd shown in figure 10. The tube / is prolonged into the blind passage s s. The oil collects in the bottom of this tube, and by removing the plug h may be drawn off from time to time. It is impossible to eliminate the use of a small amount of lubricating oil from a blower of this type, but we have found that the amount of oil mechanically carried forward by the air current is ex- tremely small and is practically all collected in the trap. Furthermore, before reentering the chamber the air passes through strong sulphuric acid, by which any hydrocarbons would be absorbed. On the other hand,
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