. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ce ; after which thewooden cylinder is with-drawn, and the lining of sandis cut or shaved away, till it hasreceived the proper lining lasts generally 5 or 6 weeks, when there are 6 meltings i, cast iron circular plate, through which the mouth ofthe furnace passes, for protect-ing the lining in k during theintroduction of the charges. N N, level of the floor of thefoundry. The portion of itbelow the running out orificeconsists of sand, so that it maybe readily sunk
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. ce ; after which thewooden cylinder is with-drawn, and the lining of sandis cut or shaved away, till it hasreceived the proper lining lasts generally 5 or 6 weeks, when there are 6 meltings i, cast iron circular plate, through which the mouth ofthe furnace passes, for protect-ing the lining in k during theintroduction of the charges. N N, level of the floor of thefoundry. The portion of itbelow the running out orificeconsists of sand, so that it maybe readily sunk when it is wish-ed to receive the melted metalin ladles or pots of large di-mensions. The fan distributes the blastfrom the main pipe to threeprincipal points, by threebranch tubes of register, consisting of acast-iron plate sliding withfriction in a frame, serves tointercept the blast at any mo-ment, when it is not desirableto stop the moving large main pipe of zinc orsheet iron is fitted to the ori-fice of the slide valve. It issquare at the beginning, oronly rounded at the angles;. 530 FOUNDING. but at a little distance it becomes cylindrical, and conducts the blast to the divaricatingpoints. There, each of the branches turns up vertically, and terminates at bb, fig. 479,where it presents a circular orifice of 7^ inches. Upon each of the upright pipes 6, theone end of an elbow-tube of zinc c c c c, fig. 479, is adjusted rather loosely, and theother end receives a tuyere of wrought iron d d, through the intervention of a shiftinghose or collar of leather c c d, hooped with iron wire to both the tube and the portion c c c c may be raised or lowered, by sliding upon the pipe b, in order tobring the nozzle of the tuyere d d, to the requisite point of the furnace. The portionc c c c may be made also of wrought iron. A power of 4 horses is adequate to drive thisfan, for supplying blast to 3 furnaces. The founders have observed the efflux of air w
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
