Journal . Schiilrowitz Knhber, p. 255, and Potts Chemistry of Rubber 5 Analyst, 1913, 38, 55U (see this J., 1914, 34).II Potts Chemistry of Rul>ber Industry, p. 53. B 2 588 GROSSMANN—THE CONCENTRATION OF SEWAGE SLUDGE. [June 15, 1915. rim of a wheel. File-makers condemned thedesign as impracticable, and on reconsiderationthe present apparatus was constructed. The abrasive surface consists of a circular file,*made from a 1-inch diameter rod of file steel,the cutting edges being parallel to the axis. Thisis mounted in bearings set on a bed plate, andhas a double pulley keyed to one end. A sma
Journal . Schiilrowitz Knhber, p. 255, and Potts Chemistry of Rubber 5 Analyst, 1913, 38, 55U (see this J., 1914, 34).II Potts Chemistry of Rul>ber Industry, p. 53. B 2 588 GROSSMANN—THE CONCENTRATION OF SEWAGE SLUDGE. [June 15, 1915. rim of a wheel. File-makers condemned thedesign as impracticable, and on reconsiderationthe present apparatus was constructed. The abrasive surface consists of a circular file,*made from a 1-inch diameter rod of file steel,the cutting edges being parallel to the axis. Thisis mounted in bearings set on a bed plate, andhas a double pulley keyed to one end. A smallelectric shunt-wound motor, of one-eighth ,furnishes the necessary motive power to drivethe file at 1200—2400 revolutions per min.,according to the pulley wheel used. Theserotational speeds correspond to peripheral speedsof 314 and (528 feet per minute, respectively. The rasped rubber faUs into a detachable trayplaced below tlie file and supported by a barrunning between the a & ? s fc 9 10 ir la ImU , I I I I I I I I I I I G
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