. Carnegie Institution of Washington publication. GENERAL DESCRIPTION OP RESPIRATION APPARATUS. 59 Fig. 28 shows the nature of the interior of the apparatus. The air enters through one opening at the top, passes down through a bent pipe, and enters a series of roses, consisting of inverted circular saucers with holes in the rims. The position of the holes is such that when the vessel is one-fourth to one-third full of sulphuric acid the air must pass through the acid three times. To prevent spattering, a small cup-shaped arrange- ment, provided with holes, is attached to the opening through wh
. Carnegie Institution of Washington publication. GENERAL DESCRIPTION OP RESPIRATION APPARATUS. 59 Fig. 28 shows the nature of the interior of the apparatus. The air enters through one opening at the top, passes down through a bent pipe, and enters a series of roses, consisting of inverted circular saucers with holes in the rims. The position of the holes is such that when the vessel is one-fourth to one-third full of sulphuric acid the air must pass through the acid three times. To prevent spattering, a small cup-shaped arrange- ment, provided with holes, is attached to the opening through which the air passes out of the absorber, and for filling the vessel with acid a small open- ing is made near one edge. The speci- fications required that the apparatus should be made absolutely air-tight to pressures of over 1 meter of water, and that there is no porosity in these vessels under these conditions is shown by the fact that such a pressure is held indefi- nitely. The inside and outside are both heavily glazed. There is no apparent action of sulphuric acid on the vessels and the slight increase in temperature resulting from the absorption of water- vapor as the air passes through does not appear to have any deleterious effect. The vessels without filling and with- out rubber elbows weigh kilograms; with the special elbows and couplings attached so as to enable them to be con- nected with the ventilating air-system, the empty absorbers weigh kilo- grams; and filled with sulphuric acid they weigh 19 kilograms. Repeated tests have shown that kilograms of sulphuric acid will remove the water- vapor from a current of air passing through the absorbers at the rate of 75 liters of air per minute, without letting any appreciable amount pass by until 500 grams of water have been absorbed. At this degree of saturation a small persistent amount of moisture escapes absorption in the acid and consequently a second absorber will begin to gain in weight. Experiments de
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