Randomized hough transform (rht) : Basic mech-anisms, algorithms, and computational complexities

A thin-film deposition apparatus having a holder and a plurality of racks. Each of the racks has a surface which has the conformation of a portion of the surface of a sphere. Means is provided for rotatably mounting the racks on the holder in such a manner that said surfaces of the racks lie generally on the surface of a common sphere. Means is provided for rotating the holder upon an axis centrally disposed with respect to the racks and for rotating the racks about their own axes of rotation with respect to the holder.