148

MODERN PAPER-MAKING

clean stock. Inside, a series of phosphor bronze cylinders or rings, which fit one
inside the other, and are driven by a motor from underneath. The stuff is led
over the centre of the machine and pours down to the bottom of the innei
container. The whole of the inner vessel is revolving at a very high speed,

[BlackJHars Engineering Co.
FIG. 43.—DIAGRAM OF TBS. ERKENSATOR, SIZE IV, SHOWING THE PATH OF THE STUFF AS rr PASSES
THROUGH
The shaded portion represents the foreign- matter trapped behind the collecting rings
so that the stuff when it reaches the bottom is immediately flung out in all
directions against the inner wall of the innermost cylinder. The spinning
action causes the stuff to drop to the bottom of the ring, where it meets with
the opposition of a lip or ring, over which it has to pass. Behind this first lip
the heaviest particles are trapped, because their specific gravity is so great that