With hammers fixed to a disc of 1 .5" diameter.
through which passes a shaft being revolved at
3000 RPM. The hammers are enclosed in a
drum, the sides and uppersurface ofwhich are
roughened. The inner surface is undulant. The
lower part of drum is made of chrome plated
brass and is detachable so that different mesh
screens (Sieves), i.e coarse, medium or fine
can be easily placed.