The manufacture of starch from potatoes and cassava . re nailed on the cylinder in sections, and when they have become dulled by use they are taken offand replaced by new sheets. The rate of revolution of the cylinder is about 600 per minute.Some of the rasps are muchlarger than the one just de-scribed, the one at Brownsfactory, in Holton, having acapacity nearly double thatjust noted. The principleof the construction, how-ever, is exactly the same. The rasping cylinder, withthe iron rasps attached, isshown in fig. 3. The rasp revolves as neara brace of hardwood as canbe, and the potatoes, bei

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The manufacture of starch from potatoes and cassava . re nailed on the cylinder in sections, and when they have become dulled by use they are taken offand replaced by new sheets. The rate of revolution of the cylinder is about 600 per minute.Some of the rasps are muchlarger than the one just de-scribed, the one at Brownsfactory, in Holton, having acapacity nearly double thatjust noted. The principleof the construction, how-ever, is exactly the same. The rasping cylinder, withthe iron rasps attached, isshown in fig. 3. The rasp revolves as neara brace of hardwood as canbe, and the potatoes, being-stopped by the brace frompassing, are reduced to afine pulp by the rapidly re-volving drum (figs. 4 and 5).Some of the modern fac-tories have specially con-structed rasps which aremore effective than thosejust described. The potato-starch factories of StevensPoint, Wis., use a large-size rasp made in Leipzig and having acapacity of 250 bushels an hour. Other factories in the West usethe grater shown in fig. 6. A stream of water is thrown upon the. Fig. 4.—Rasping machine (cross section): a, hopper; b, rasp; c, receptacle for pulp; d, buffer; e, setting screw;/, water jet. 14 potatoes as they enter the comminutor, so that the pulp is readilywashed through as it is reduced to the required degree of fineness. The various parts of the comminutor are shown in cross section infig. 4: a represents the hopper holding the potatoes: I the wood cyl-inder or rasp which revolves at a high rate of speed: c the hopper in which the potato pulp isreceived after passing therasp: d the wooden presswhich is kept in positionby means of the screw >-:through the pipe f comesthe water which aids in car-rying potatoes through therasp. The horizontal sec-tion of the rasping machineis also shown in fig. 5.Another and more compactform of potato rasp isshown in fig. 6. The pulp falls from therasper onto a starch separa- FiG.e.-Plan of rasping machine. ^ ^ ^^ q{ ^.^ consists of wire gauze having thir