raised e g on the order of approximately 5 millimeters it has also proven to be advantageous in practice to achieve an economical manufacture and assembly of the emery roller 1 to configure the recess 9 of each beater blade 3 in the form of a circular arc of a uniform radius of curvature as viewed in cross section taken radially with respect to the emery roller 1 and in turn of a substantially flat longitudinal extent as viewed in cross section taken axially with respect to the emery roller 1 in the illustrated embodiment the recess 9 of each beater blade 3 is formed of an arcuate configuration having a radius of curvature on the order of approximately two thirds of the overall circumferential dimension of each beater blade 3 at the outer periphery 10 of the emery roller 1 it will therefore be readily understood by those persons skilled in the art that the present invention is susceptible of a broad utility and application many embodiments and adaptations of the present invention other than those herein described as well as many variations modifications and equivalent arrangements will be apparent from or reasonably suggested by the present invention and the foregoing description thereof without departing from the substance or scope of the present invention accordingly while the present invention has been described herein in detail.