The American journal of science and arts . eair will pass in through the tube A and the upward opening the center of the disc F, is an aperture, as in common airpumps, into which a tube may be screwed, and directly beneath * Vol. xxxiii, page 237. Description of an Air Pump. 87 it is another aperture communicating with the tube G ; and thepart EC is constructed in such a manner, that when E is upAvard,a passage is opened between the aperture F and tube A, and alsobetween the tubes B and G. If the pump be now worked, it isevident the air will pass in at F and out at G, that is, it exha
The American journal of science and arts . eair will pass in through the tube A and the upward opening the center of the disc F, is an aperture, as in common airpumps, into which a tube may be screwed, and directly beneath * Vol. xxxiii, page 237. Description of an Air Pump. 87 it is another aperture communicating with the tube G ; and thepart EC is constructed in such a manner, that when E is upAvard,a passage is opened between the aperture F and tube A, and alsobetween the tubes B and G. If the pump be now worked, it isevident the air will pass in at F and out at G, that is, it exhaustsat F and condenses at G. If, however, we give EC a quarter ofa revolution, and bring C upward, the passages from A to F, andfrom B to G, are closed, and others opened from B to F, and fromA to G ; and by working the pump the air will now be made topass in at G, and out at F, or in the reverse direction from thatjust described. This pump, therefore, like the one described byDr. Hare, when worked is constantly exhausting and The uses to which this air pump may be applied, obviouslyinclude all those of a common air pump and condenser; andalso enables the operator to transfer any gas that will not corrodethe metals from one vessel to another, (as does that of Dr. Hare.)To do this, it is only necessary to attach tubes at F and G lead- 88 Indian Mounds and Earthworks. ing to the different gasometers or other vessels between whichthe transfer is to be made ; and by means of the part EC the gasbe made to pass in either direction at pleasure. I ought to remark before closing, that previous to my applica-tion to Messrs. Brown & Francis, they had manufactured severalair pumps of this description, with the exception of the tube G,which was added at my suggestion; and which adapts it in a pe-culiar mEinner for use in a chemical laboratory. Messrs. Brown & Francis also manufacture a much smaller airpump, with a single barrel of the same construction. Art. VIII.—Notes respe
Size: 1505px × 1661px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookidamericanjournalo341838newh, bookyear1820
