Joseph P. Bradley

“ It was not new to produce contrasts and variations in light and shade, or stereoscopic effects, by depressions or elevations in the surface of materials. It was old to do this by arranging them in parallel lines, as in wood, plaster, and corduroy cloth. It is not novelty which will sustain a design patent to transfer to rubber, or to a rubber mat, an effect or impression to the eye which has been produced upon other materials or articles by contrast or variation of light and shade. ”

“ A is a mat, which is, as represented, square, although it might be oblong, or other desired shape. It is divided into a number of sections, a, b, c, d, the corrugations or depressions and ridges in those represented by the same letter being parallel. Thus in the center and outer border formed by the section a, b, the corrugations extend around the mat parallel with its outer edge and with each other. At the points where each depression crosses the diagonals drawn from corner to corner of the mat through the center, it makes a right angle with its previous path. ”

“ If the person changes his position continuously the effects are kaleidoscopic in character. In some cases moire effects, like those of moire or watered silk, but generally mosaic effects, are produced. Stereoscopic effects also, or the appearance of a solid body or geometric figure, may, at times, be given to the mat, and, under proper conditions, an appearance of a depression may be presented. The design consists in parallel lines of corrugations, depressions, or ridges, arranged to produce the effects as above indicated. The drawing represents a mat embodying this design. ”