The Iron and steel magazine . grains, aresubjected to a pressure of 15 pounds per square inch and com-pressed into the space of 1 cubic foot and the temperature ismaintained at 70 degrees, 8 grains must condense and can beremoved. If the space is cooled to 50 degrees, 4 more grainsmust condense and can be removed; so that there are only 4grains left in the original 2 cubic feet of air, or 2 grains in each. The average pressure blown is 15 pounds. By coolingunder 15 pounds blast pressure, it is therefore possible to keepthe moisture of the blast down to one half of what it would beif it was sat
The Iron and steel magazine . grains, aresubjected to a pressure of 15 pounds per square inch and com-pressed into the space of 1 cubic foot and the temperature ismaintained at 70 degrees, 8 grains must condense and can beremoved. If the space is cooled to 50 degrees, 4 more grainsmust condense and can be removed; so that there are only 4grains left in the original 2 cubic feet of air, or 2 grains in each. The average pressure blown is 15 pounds. By coolingunder 15 pounds blast pressure, it is therefore possible to keepthe moisture of the blast down to one half of what it would beif it was saturated at the temperature of the cooling water, andwe may, therefore, employ water at natural temperature forcooling. Monongahela River water has in summer a temperature of70 degrees and in winter of 35 degrees, so that the moisture canbe kept down in summer by its use to 4 grains and in winterto i\ grains. The moisture will vary slowly between these twoextremes, as shown by curve B in Fig. 3. 482 The Iron and Steel Magazine. The apparatuswhich I propose consistsof a vertical cylindricalvessel of sheet iron, 60feet high and 12 feet indiameter. It is closedat both ends and con-tains 4 horizontal tubesheets. The first andsecond, and the thirdand fourth tube sheetsare 22 feet apart. Thefirst tube sheet is con-nected with the bottomplate of the vessel by acentral tube 3-^ feet indiameter. The secondtube sheet with thethird in the same man-ner and also the fourthtube sheet with the topof the vessel. The firstand last tubes are con-nected by six T braceswith the middle tube sheets arebraced each with 12I-beams. A set of 1,000 boilertubes 2 J inches diameterconnects the fourth andthird tube sheets and aset of 1,000 boiler tubesof two inches diameterconnects the second andfirst tube sheets. Thetubes are 22^ feet longand project 5 inchesbelow the lower tubesheet. New Developments in Dry Blast The Mast from the blowing engines enters at the top abovethe fourth tube sheet, passes
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Keywords: ., bookcentury1800, bookdecade1890, bookidironsteel, booksubjectiron
