Bersch, Josef, 1840-1907, Bersch, Wilhelm, 1868-1918, Salter, Charles · London, Scott, Greenwood, & Son, New York, D. Van Nostrand Company · leaf 94
PREPARATION OF THE COLOUR EARTHS 79 rate of feed being adjustable. The screened product is discharged through a shoot at one side of the machine, and the residue at the opposite side, into boxes, etc., placed underneath. For materials that give off a large amount of dust, the machine can be… … FIG. 22. into drawers. The machine is easily cleaned and the sieves quickly changed, and is well adapted for dealing with a succession of different materials. The hopper can be fitted with a pair of adjustable crushing rollers. Fig. 22 is a drum sifter, which is fed by means of a hopper and worm ;…
Pigments · Coloring matter
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