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e paper through a trough of size between two endless felts. 1853. Brown and McIntosh, Aberdeen, Scotland. Hollow perforated mold, covered with felt, to which the pulp is caused to adhere by rarefaction of the contained air. 1853. Machine patented in England for preparing wood for making paper. 1856. Horace W. Peaslee, Malden Bridge, N. Y. Drying cylinder for paper-machines, comprising spiral tubular heater, non-conducting cylinder, and exterior metallic casing. V. O. Balcom, Bedford, Mass. Revolving pulp-tub with grooved grinding roller rotated therein at a different rate of speed. Thomas Lindsay and Wm. Geddes of Connecticut. Varying the width of paper while the machine is in operation by forming the trough which delivers pulp to the web in two parts, sliding one over the other and varying the distance apart of the decklestraps. 1859. M. L. Keen, Roger's Ford, Pa. Paper-stock boiler for ligneous matters. Martin Nixon, Philadelphia. Boiler for treating paper-sto