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629,197 · Mark · "Vault-Light or Illumination-Tile" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

629,197: 2 of 3

of the plates may be varied as desired so long as the characteristic features of my joint be retained.     I do not restrict myself to the use of my invention in any particular situation, as it is equally applicable to sidewalks, floors, and roofs.     Having thus described my invention, what I claim is--     1. The combination of a frame or support, plates on the latter, and a joint or joints formed by flanges and grooves, or channels, the walls of the latter and the flanges being separated by spaces, to permit relative movement of the parts under changes of temperature, substantially as and for the purpose described.     2. The combination of a frame or support, plates on the latter having interlocking portions at their edges, consisting of a flange on one plate, and a groove or channel in the other, the sides of the groove and the flange

being separated by spaces to permit relative movement of the parts under changes of temperature, substantially as and for the purpose described.     3. The combination of a frame or support, plates on the latter having perforations with glasses or lenses thereover, cement or concrete in the spaces between the glasses, and a joint or joints formed by flanges and grooves, or channels, the walls of the latter and the flanges being separated by spaces to permit relative movement of the parts under changes of temperature, substantially as and for the purpose described.     In testimony that I claim the foregoing I have hereunto set my hand this 27th day of December, 1898. JACOB MARK. Witnesses:     CHRISTIAN HENRY MÜLLER,     JACOB L. MARK.