. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. st-iron potsof the form shown in fig. 135, about three eighths of an inch thick, two of which aredexterously placed with their mouths in contact, and then luted together with lip of the upper pot is made to slip inside of the under one. These double vessels,containins together about fifty pounds of bones, are arranged alongside, and over eachother, in an oven, like a potters kiln, till it be filled. The oven or kiln may be eitheroblong or upright. The. latter is represented
. A dictionary of arts, manufactures and mines : containing a clear exposition of their principles and practice. st-iron potsof the form shown in fig. 135, about three eighths of an inch thick, two of which aredexterously placed with their mouths in contact, and then luted together with lip of the upper pot is made to slip inside of the under one. These double vessels,containins together about fifty pounds of bones, are arranged alongside, and over eachother, in an oven, like a potters kiln, till it be filled. The oven or kiln may be eitheroblong or upright. The. latter is represented in figs. 136, 137, 138. a is the fireplaceor grate for the fuel; c c are the openings in the dome of the furnace through whichthe flame flows; the divisions of these orifices are shown in fig. 138. b is the wall ofbrick-work, d the space in which the pots are distributed, e is the door by which the•workman carries in the pots, which is afterwards built up with fire-bricks, and plasteredever with loam. This door is seen in fig. 136. f f are the lateral flues for conveyingthe disengaged gases into the HDHJ- Fig. 139 is a longitudinal section, and fig. 140, a ground plan of a horizontal kiln forcalcining bones, a is the fire-chamber, lying upon a level with the sole of the kiln ; itis separated by a pillar b, from the calcining hearth c. In the pillar or wall, severalrows of holes d, are left at different lieights; e is the entrance door; f, the outlet ventsfor the gases, vapors, and smoke, into the chimney g; h, a sliding damper-plale for regu-lating the admission of the air into the fire in the space a. By this arrangement the offensive emanations are partly consumed, and partly carriedoff with the smoke. To destroy the smell completely, the smoke should be made to passthrough a second small furnace. The number of pots that may be put into a kiln of this kind depends, of course, uponits dimensions; but, in general, from 100 to 150 are piled up over each other, in column
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Keywords: ., bookcentury1800, bookdecade1840, booksubje, booksubjecttechnology
