Be it known that I, SIEGFRIED MARCUS, of the city and county of Philadelphia, State of Pennsylvania, have invented and produced a new and original Design for Prismatic Glass Lights, of which the following is a specification.

My new design for prismatic glass lights is shown in the accompanying drawings, in which—

Figure 1 is a plan view of the light. Fig. 2 is an end edge elevation of the same, and Fig. 3 is a longitudinal sectional view on the line A A of Fig. 1.

The essential feature of the design resides in the prismatic face, which is composed of a series of rows of parallel prismatic ribs a b c, the ribs of each row being separated by intermediate parallel plane surfaces d e f and the ribs of each row being out of line with

the ribs of the adjacent row. The prismatic face thus formed has a checkered surface composed of alternate prisms and plane surfaces. The ends of the prisms are inclined and notched. The ends of the prisms in each row touch the ends of the prisms in the adjacent rows, so that no plane spaces intervene.

What I claim as new, and desire to secure by Letters Patent, is—

The design for a prismatic glass light substantially as described and shown in the accompanying drawings.

In testimony of which invention I have hereunto set my hand.