. The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing. . bevilled inwards at some distance above thestones surface. Thus there is a current of cold air passing fromthe running eye up outside the stone and inside the it meets the heated current from the grinding surfaces atright angles; and breaking this heated current, whatever grainedmaterial is held in suspension, falls back within the bottom casing,whilst the heated air passes off through the wire
. The practical draughtsman's book of industrial design, and machinist's and engineer's drawing companion: forming a complete course of mechanical, engineering, and architectural drawing. . bevilled inwards at some distance above thestones surface. Thus there is a current of cold air passing fromthe running eye up outside the stone and inside the it meets the heated current from the grinding surfaces atright angles; and breaking this heated current, whatever grainedmaterial is held in suspension, falls back within the bottom casing,whilst the heated air passes off through the wire-cloth, againmeeting at right angles with a cool current from the upper side ofthe top stone, which, in conjunction with the bevilled top of theupper case, still further separates the suspended flour, and aidsthe ventilation. Another modification of stones relates to thecombination of three or more separate stones, instead of two, ashitherto used. In this plan, which is represented in fig. 9, thecentral stone, A, is the runner, the upper and lower ones, b, c,being fixed, so that the grinding is performed both between theunder surface of the upper stone at d, and the upper surface of. the central runner, and between the under surface of the latterand the upper surface of the bottom fixed stone at e. The grainis fed through thepipe, F, into thehopper, G, throughthe adjustable feed-passage into the pipe,H. Hence the supplyfor the upper grind-ing surfaces passesout by the inclined. lateral opening, i,into ithe hollow space, j,in the upper stone,forming the lower ipart of the eye there-of. Here it falls onto the disc, k, and isdirected to the grind-ing surfaces. The supply of grain for the lower or secondary grinding action passesout at the bottom of the pipe, h, into the eye of the runner, a,and thence proceeds to. thggrinding surface. The upper stone issupported by side brackets, these brackets being carried on thelower annular casing, l, bolted down to the floor. The bottomstone
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Keywords: ., bo, bookcentury1800, bookdecade1850, booksubjectmechanicaldrawing
