Grain flow propelled grain spreader

A grain spreader comprising support means attachable to an upper part of a grain bin, a hopper disposed beneath said support means, means rotatably mounting said hopper on said support means for rotation about a vertical axis, fins attached to said hopper and disposed at least mostly above the bottom of said hopper, said fins being disposed at angles with respect to the vertical such that when grain is directed so as to flow into the top of said hopper said grain will strike said fins and exert forces on said fins causing rotation of said hopper in a given direction, said hopper having an open top and bottom, a plurality of elongated slides each extending downwardly from the underside of said hopper and away from said axis at an angle with respect to the vertical and disposed such that said grain can flow out of the bottom of said hopper and down said slides, means attaching said slides to said hopper so that said slides are maintained in the position described, each slide having a leading side and a trailing side with respect to the rotation of said hopper, each slide having a barrier wall means on the leading side thereof so as to restrain grain from spilling off said leading side, means along each said slide and so disposed as to cause grain gravitating down said slides to fall at various positions from the trailing side along the length thereof.