Section 13.—CRUSHING, GRINDING, AND DISINTEGRATING.
[250]. Stamp mill, generally arranged in a battery of 4 or 6, for gold and other ores.
[251]. Stone-breaker, with chilled iron jaw faces and toggle or knapping motion. See Blake’s, H. R. Marsden’s, and other modifications in common use.
[252]. Double edge-runners. Sometimes driven below. In some designs the rollers revolve, and in others the pan revolves and the roller shaft is stationary.
[253]. Lucop’s patent centrifugal pulveriser.
[254]. Carr’s patent disintegrator. In this machine, each ring of bars is driven at a high speed in opposite directions inside a casing, the material being broken by the rapidity and intensity of the blows it receives.
[255]. Horizontal centrifugal roller mill. The material is crushed between the rollers and the shrouding of the pan by the centrifugal force of the rollers, which are suspended from a crosshead.
[256]. Cone roller mill, with vertical spindle.
[257]. Cone roller mill, with horizontal spindle and conical pan.
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[258]. Enclosed cone roller mill, with horizontal spindle and spirally grooved roller and casing.
[259]. Toothed sector mill.
[260]. Conical edge runner and pan.
[261]. Ordinary flour mill. The material is fed in the centre, passes between the stones, and falls out into the outer casing.
[262]. Rattle barrel, for cleaning and burnishing articles by mutual attrition; sand or emery is sometimes used to assist the process.
[263]. Ball and pan mill, for crushing ores, &c. The balls are carried round by a cross arm fixed to the central spindle.
[264]. Inclined ball and pan mill.
[265]. Oscillating mill.
[266]. Drum and roller revolving mill.
[267]. Cradle and roller mill.
[268]. Cone disc mill; the cones being inclined axially to one another, the material is crushed at the lower side of the cones.
[269]. Another form of stone breaker with toggle motion.
[270]. Horizontal cone plate mill.
[271]. Revolving stamp and pan mill for ores.
[272]. Vertical cone mill.
[273]. Revolving pan and ball mill.
[274]. Planishing discs for accurately rounding iron bars. See the patent rolled shafting in use, manufactured by the Kirkstall Forge Co. and others.
[275]. Vertical cone grinding and crushing mill. The vertical shaft has an eccentric motion at the footstep, giving a swaying rotatory motion to the grinding cone.
[276]. Crushing rollers with spring bearing.