Foreign art collection including apparatus having (1) material separating flow passages resulting from closely spaced parallel or concentrically arranged members along the faces of which system fluid is constrained to pass without reliance upon change of direction for separation but which provide either (a) a screen or grid-like pattern at the inflow end of the arrangement or (b) surfaces on which constituent material may settle or drop; or (2) surface member(s) with somewhat exaggerated nap-like or pile-like covering along which the system fluid moves such that in effect the constituent material is swept out of the fluid stream.
