Up: Patent Index

586,248 · Soper · "Vault-Light" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

586,248: 2 of 3

the principal prism I have called the "secondary" prisms.     I have spoken of my device as a "vault-light." By this term I mean a "prism-tile," and this latter is the term which I prefer to use.     I claim—     1. A prism-tile consisting of a body of transparent material having on one side a receiving-surface and on the other side a prism provided with front and rear principal refracting and reflecting surfaces, and with edges which converge toward the receiving-surface which are substantially flat and lie in planes substantially parallel with the direction in which the light treated by the principal surfaces

is projected, and secondary prisms on such edges.     2. A prism-tile consisting of a body or transparent material having on one side a receiving-surface and on the other a prism provided with front and rear principal refracting and reflecting surfaces, and edges which are provided with secondary prisms and lie in planes substantially parallel with the direction in which the light treated by the principal surfaces is projected. FRANK C. SOPER. Witnesses:     DONALD M. CARTER,     J. P. APPLEMAN.