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579,350 · Pennycuick · "Shade or Globe" · Page 2 Home  > Prism Glass  > Patent Index  > Page 2

579,350: 2 of 3

and, as examples, I would refer to Figs. 5, 6, 7, and 8, which show on a smaller scale outline views of different forms of shades or globes in which the principal feature of my invention may be carried out with more or less success, but in view of the different shapes of these globes or shades it would be difficult to carry out all over the same the peculiar arrangement of the prisms that I believe to be essential to the most useful result, except in that form shown in Fig. 8. These forms, however, are only given as examples of different styles that might be employed without limiting myself to these only. It will of course be understood that Figs. 5, 6, 7, and 8 are shown only in outline and that the shades or globes are in reality formed with prisms thereon, as shown in the enlarged detail, Fig. 4.     I prefer to make the shades integral, but in some cases I may make them in sections, as indicated in Fig. 3, where a shade is shown formed in two parts with flanges 6 on each, by which they may be joined with any suitable cement or other fastening means.     For many years various means have been tried for diffusing and tempering the intense glare of the electric arc, such as frosted and colored glasses, but as these absorb so much light they are wasteful and useless where extensive illumination is required; but when my improved shade is used the rays proceeding from the arc are collected and diffused in a horizontal and downward direction, so as to not only give the lamp much more illuminating power, but also to so diffuse it that it may be looked at without injury to the eye.     I am aware of the English Patent No. 911 of 1859 and United States Patent No. 538,193 and also of the foreign patents granted on the shade shown in the latter and make no claim to anything shown therein, as I regard my invention as essentially different therefrom.     In the following claims I have stated the precise angles of which I prefer to make the prismatic ribs, but it will be easily seen that a slight variation from said angles will not be a departure from my invention, and I

therefore intend my claims to cover my invention if such slight variations are made.     What I claim as new is--     1. A shade or globe for electric or other lamps, having a series of horizontal prismatic ribs molded thereon, the said ribs having their upper faces formed at an angle of one hundred and five degrees to the surface of the side of the shade, and the lower faces of said prismatic ribs formed at an angle of forty-five degrees, substantially as and for the purpose specified.     2. A shade or globe for electric or other lamps, made of polygonal form and having a series of horizontal prismatic ribs molded thereon, the said ribs having their upper faces formed at an angle of one hundred and five degrees to the surface of the side of the shade, and the lower faces of said prismatic ribs formed at an angle of forty-five degrees, substantially as and for the purpose specified.     3. A shade or globe for electric and other lamps, of curved outline in vertical section and of polygonal form and having a series of horizontal prismatic ribs molded thereon, the said ribs having their upper faces formed at an angle of one hundred and five degrees to the surface of the side of the shade, and the lower faces of said prismatic ribs formed at an angle of forty-five degrees, substantially as and for the purpose specified.     4. A shade or globe for electric or other lamps molded in sections, the said sections having horizontal prismatic ribs formed thereon, the said ribs having their upper faces formed at an angle of one hundred and five degrees to the surface of the side of the shade, and the lower faces of said prismatic ribs formed at an angle of forty-five degrees, substantially as and for the purpose specified.     In testimony whereof I affix my signature, in the presence of two witnesses, this 22d day of April, 1896. JAMES G. PENNYCUICK. Witnesses:     THOS. E. ROBERTSON,     W. E. CLENDANIEL.