A light-projecting glass, having upon one face a series of prism-bars, and upon the other face a series of shallow lens-bars, disposed transversely with respect to the prism-bars and presenting outer convex faces of such radius of curvature that an incident ray, striking any part of the outer surface, and refracted thereby, will pass through the glass without reflection from an internal surface of the lens-bar, substantially as specified.

In testimony that we claim the foregoing as our invention, we have hereunto signed our names this 3rd day of October, A. D. 1900, at Philadelphia, Pa.

Signed in the presence of

[Signed] Arthur E. Paige
Ella A. Paige