Compressed air . ENCE AND AIRNEED FOR AIR-LIFT PUMPING. c•a ^ 2^ . 2d 3 s ai- — ® . ?5 = al. ca § 5 ?5 2 c £ aE = - £III •0 ^ K B - =1- *- S aT. s 031 - 0 M3 00 a <;«- 25 2 38 60 17 20 50 3 75 100 33 44 75 113 49 65 100 6 200 65 87 125 188 82 lOit ISO 9 225 30(J 98 12() 175 263 350 115 200 12 300 400 130 173 U| water and accumulations are blown out withgreat force, and it will be necessary to pro-tect objects within 10 or 15 feet of the wellfrom possible injury. THE HO
Compressed air . ENCE AND AIRNEED FOR AIR-LIFT PUMPING. c•a ^ 2^ . 2d 3 s ai- — ® . ?5 = al. ca § 5 ?5 2 c £ aE = - £III •0 ^ K B - =1- *- S aT. s 031 - 0 M3 00 a <;«- 25 2 38 60 17 20 50 3 75 100 33 44 75 113 49 65 100 6 200 65 87 125 188 82 lOit ISO 9 225 30(J 98 12() 175 263 350 115 200 12 300 400 130 173 U| water and accumulations are blown out withgreat force, and it will be necessary to pro-tect objects within 10 or 15 feet of the wellfrom possible injury. THE HONIGMANN METHOD OFSHAFT SINKING. BY ADOLF E. HAKTMANN. Coal mining has been carried on in westernGermany for several centuries, and as a re-sult, all the coal deposits near the surface,when geological conditions were favorable,were soon worked out. Only deep-lying seams,or those which could not be opened on ac-count of the thickness of the overlying quick-sand, remained. The quicksand in this region. METHOD, varies from a few feet to 600 ft.; consequentlythe problem is to sink shafts through this un-stable stratum. Three methods are now suc-cessfully employed. They are as follows: i. versed, where the air pressure is high, the Engineering and .Mining Journal. 4142 COMPRESSED AIR, The Sassenberg-Clennont method. 2. ThePoetsch freezing method. 3. The Honigmaimmethod. The first two methods are well known. Thethird has not been used much outside theGerman coalfields, although it has proved ef-ficient. The Honigmann method differs from othersinking methods in the respect that no casingis built until the shaft has been completelysunk through the sand to the solid rock for-mation. To prevent caving in, Honigmannproceeds as follows: 1. The water-level in the shaft is raised toa certain height above the natural water-levelin the quicksand outside the shaft. 2. The specific gravity of the water columnin the shaft is increased to about by mixingcla} with the wate
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectcompres, bookyear1896
