. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. isan oaken tub, 55 feet high, 3^ feet wide at top, and 3 atbottom, set upon wooden beams, which raise its bottomabout 14 inches from the floor. At a distance of 15 inchesabove the bottom, the tub is pierced with a horizontal rowof 8 equidistant round holes, of an inch in diameter. At 5inches beneath the mouth of the tub, a thick beech-woodhoop is made fast to the inner surface, which supports acircular oaken shelf, leaving a space round its edge of Ifinches, which is stufled water t
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. isan oaken tub, 55 feet high, 3^ feet wide at top, and 3 atbottom, set upon wooden beams, which raise its bottomabout 14 inches from the floor. At a distance of 15 inchesabove the bottom, the tub is pierced with a horizontal rowof 8 equidistant round holes, of an inch in diameter. At 5inches beneath the mouth of the tub, a thick beech-woodhoop is made fast to the inner surface, which supports acircular oaken shelf, leaving a space round its edge of Ifinches, which is stufled water tight with hemp or tow. Inthis shelf, 400 holes at least must be bored, about | of aninch in diameter and Ij inches apart; and each of thesemust be loosely filled with a piece of packthread, or cottonwick, which serves to filter the liquid slowly the same shelf there are likewise four larger holes of 1| inches diameter, and 18inches apart, each of which receives air-tight a glass lube 3 or 4 inches long, having itsends projecting above and below the shelf. These tubes serve to allow ihe air that. 624 GRANITE. enters by the 8 circumferential lioles, to circulate freely through the graduator. Themouth of the tube is covered with a wooden lid, in whose middle is a hole for the insertionof a funnel, when the liquor of acetification requires to be introduced. One inch abovethe bottom, a hole is bored for receiving a syphon-formed discharge pipe, whose uppercurvature stands one inch below the level of the holes in the side of the tub, to preventthe liquor from rising so high as to overflow through them. The syphon is so bent as toretain a body of liquor 12 inches deep above the bottom of the tub, and to allow the ex-cess only to escape into the subjacent receiver. In the upper part of the graduator, butunder the shelf, the bulb of a thermometer is inserted through the side, some way intothe interior, having a scale exteriorly. The whole capacity of the cask from the botto
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
