Compressed air production; or, The theory and practice of air compression . on patented the application of compressed air for driving machinedrills in tunnels. The first notable use of compressed air is due to , of Geneva, whose plans were adopted at the Mont Cenis tunnel. COMPRESSED AIR PRODUCTION. 23 M. Sommeiller developed the Colladon idea and constructed the com-pressed air plant illustrated in Fig. 7. The Sommeiller compressor was operated as a ram, utilizing anatural head of water to force air at 80 pounds pressure into a column of water contained in tne long p
Compressed air production; or, The theory and practice of air compression . on patented the application of compressed air for driving machinedrills in tunnels. The first notable use of compressed air is due to , of Geneva, whose plans were adopted at the Mont Cenis tunnel. COMPRESSED AIR PRODUCTION. 23 M. Sommeiller developed the Colladon idea and constructed the com-pressed air plant illustrated in Fig. 7. The Sommeiller compressor was operated as a ram, utilizing anatural head of water to force air at 80 pounds pressure into a column of water contained in tne long pipe on the side of the hillwas started and stopped automatically, by valves controlled by weight and momentum of the water forced a volume of air withsuch shock against a discharge valve that it was opened and the air wasdischarged into the taipk; the valve was then closed, the water checked; aportion of it was allowed to discharge and the space was filled with air,which was in turn forced into the tank. The efficiency of this compressorwas about 50 per ffl^^^J fig. air compressor used at the mt. cents tunnel. At the St. Gothard tunnel, begun in 1872, Prof. Colladon first intro-duced the injection of water in the form of spray into the compressorcylinder to absorb the heat of compression. Fig. 8 illustrates the air cylinder of the Dubois-Francois type of com-pressor, which was the best in use about the year 1876. This com-pressor wras exhibited at the Centennial Exposition and was adopted byMr. Sutro in the construction of the Sutro tunnel. A characteristic feat-ure seems to be to get as much water into the cylinder as possible. Thewater which flooded the bottom of the cylinder arose from the voluminousinjection; this water was pushed into the end of the cylinder and some ofit escaped with the air through the discharge valve. An improved pattern of this compressor is shown in Fig 9. The first air compressor used on a large scale for practical wo
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Keywords: ., bookcentury1800, bookdecade1890, bookid, booksubjectcompressedair
