Annual report of the Regents . undseach. The wet pan has a solid bottom, in which there is a doorthrough which the material can escape when sufficiently tempered. A good dry pan will grind 100 tons in lOi hours through oneeighth inch screens.^ Two scrapers are placed in front of the rollers to throw the ma-terial in their path. Disintegrators. These, of which the Stedman disintegrator is agood type, consist of several series of concentric drums which re-volve in different directions. The material to be pulverized is fedinto the disintegrator by means of a hopper, and as soon as it entersis cau
Annual report of the Regents . undseach. The wet pan has a solid bottom, in which there is a doorthrough which the material can escape when sufficiently tempered. A good dry pan will grind 100 tons in lOi hours through oneeighth inch screens.^ Two scrapers are placed in front of the rollers to throw the ma-terial in their path. Disintegrators. These, of which the Stedman disintegrator is agood type, consist of several series of concentric drums which re-volve in different directions. The material to be pulverized is fedinto the disintegrator by means of a hopper, and as soon as it entersis caught between the staves of the first drum, and thrown by thisagainst the next inner one, which revolves in the opposite direc-tion, and from this one against a third inside of the second, revolv-ing in the same direction as the first. The clay particles by beingviolently thrown against the staves and against each other are 1 Ohio geol. sur. 1893 p. 142. E. Orton jr. Clays and clay-working in-dustries of Ohio. CDCDO a <vo o B. CLAYS OF XEW YORK 657 rapidly reduced to a fine state of division, the whole operationtaking not over one or two seconds. The material is then dis-charged on an endless belt, and carried to the screens. The dis-integrator is inclosed in a metal case. The series of drums, thevelocity with w^hich they revolve, and the strength and the arrange-ment of the staves depend on the hardness of the material to bepulverized, and also on the degree of fineness to which it is to bereduced. By varying the velocity of the disintegrator a coarser orfiner product is obtained. The capacity of this type of machine is very great, but it alsorequires considerable power to operate it. According to capacitydisintegrators can pulverize in one hour from 8000 to 28,000pounds of material, such as shale, gypsum, etc. They require 2 J to4 horse power for every ton of material pulverized in an hour. Ball mills. These consist of a large drum which revolves on ahorizontal axis. This dr
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