. Cassier's magazine . edof the plungers varies from 100 to 200strokes per minute, and the lengthof stroke varies from 1% to T/\. inch,according to the coarseness of thecoal to be washed, the high num-ber of strokes and the short strokeadopted for the finer sizes of coal. The speed of the nut washingplungers varies from 50 to 100strokes per minute, and the lengthof stroke varies from 5 to 1^2 inches,according to size of the coal treated. (b) Jigs with movable sieves. The best-known of this kind is theSheppard two-compartment felsparwasher. The sieves are attached totwo rods, which are secured
. Cassier's magazine . edof the plungers varies from 100 to 200strokes per minute, and the lengthof stroke varies from 1% to T/\. inch,according to the coarseness of thecoal to be washed, the high num-ber of strokes and the short strokeadopted for the finer sizes of coal. The speed of the nut washingplungers varies from 50 to 100strokes per minute, and the lengthof stroke varies from 5 to 1^2 inches,according to size of the coal treated. (b) Jigs with movable sieves. The best-known of this kind is theSheppard two-compartment felsparwasher. The sieves are attached totwo rods, which are secured at theirupper ends to a rocking lever, asshown in Fig. 12. By this arrange-ment the sieves and their contentsare balanced and the action of thewater on the underside of the sievesis uniform. The water enters thehutch at the points A A. The shale,which falls into the hutch, is re-moved by screw conveyors vS 5\ Theplungers make one hundred andeighty *4-mcn strokes per minute oncoal which has passed through a^8-inch FIG. 12. SHEPPARD TWO-COMPARTMENT FELSPAR WASHER WITH MOVABLE SIEVE 624 CASSIERS MAGAZINE TROUGH WASHERS The Elliot trough washer is animprovement on the old troughwasher, which retains all the advan-tages of simplicity and economy ofthe old system, without any of itsdrawbacks. It is automatic and con-tinuous in its action, the coal andwater being delivered at the lowerend and the dirt at the upper end ofthe trough. The washer consists ofa cast-iron or steel trough about 18inches wide at the bottom and 30inches wide at the top and 12 inchesdeep, and about 60 feet long, (seeFig. 13), set at an inclination of 1in 12 for general purposes. Fortreating coal between 2 and 3 inchesdiameter a steeper inclination willgive better results. At each end ofthe trough sprocket wheels are fixed,driving endless chains, to which con-cave and convex scrapers from 1^2to 3 inches deep are attached at dis-tances of 2 to 5 feet apart (thesmaller dimensions are applicable tothe finer s
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