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627,848 · Fugman · "Glass Prism-Plate" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

627,848: 2 of 3

such plates as heretofore constructed have been so liable to break along said grooves that it has been found practically impossible to use plates more than four or five inches square. These small plates or "tiles," as they are sometimes called, are necessarily secured in suitable framing in order to cover the opening through which the light passes. This framing intercepts a very considerable quantity of light which would otherwise pass through. In order that it shall intercept as little light as possible, it is made of metal, and this is very expensive.     The plate heretofore described and having the construction pointed out in the claims may be made of any size, and because there are no long grooves extending across it in any direction it is not liable to break and does not need to be used in small pieces.     Having described my invention, I claim—     1. A glass prism-plate having one side made up of a plurality of angular-faced prismatic lugs which are arranged in rows, each row containing a plurality of such lugs, which are staggered with respect to the lugs in the rows above and below them, the upper part of each lug being between and in contact with the

lower part of the adjacent lugs in the row above it, and its lower part being between and in contact with the upper part of the adjacent lugs in the row below it, substantially as specified.     2. A glass prism-plate having one side made up of a plurality of angular-faced prismatic lugs which are arranged in rows, and each row containing a plurality of such lugs which are staggered with respect to the lugs in the rows above and below them, the upper part of each lug being between and in contact with the lower part of the adjacent lugs in the row above it, and its lower part being between and in contact with the upper part of the adjacent lugs in the row below it, the angular refracting-faces of all the lugs in any row being in the same plane which is parallel to the plane in which the refracting-faces of the other rows of lugs lie, substantially as specified.     In testimony whereof I hereunto affix my signature in the presence of two witnesses. GODFREY FUGMAN. Witnesses:     E. B. GILCHRIST,     E. L. THURSTON.