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595,264 · Ewen · "Figured Prism-Light" · Page 3 Home  > Prism Glass  > Patent Index  > Page 3

595,264: 3 of 6

It is to be observed that the receiving-surface according to my invention is preferably provided with a design distinguished from mere markings which do not produce the effect, for it is in part because the eye is arrested by the design as such that the glittering effect of the wavy surface is lost sight of. Moreover, the lines which form the design are also preferably distinguished from grooves or markings having inclined sides or edges, though I prefer a very slight inclination to the edges of the elements of the design. Still if these sides are considerably inclined— as, for example, in the case of mere corrugations— then the illuminating effect of the prism-light is very greatly reduced, and this is not permissible, since of course the primary object of the prism-light is to illuminate the interior with which it is associated.     Of course, as I have described my invention, it will be clear that the above results are obtained by molding or forming the transparent material in the manner indicated in the process of the construction of the prism-light.     Of course these prism-lights are commonly made of glass. The various lines of which the design are formed need not intersect each other, though in many forms of the design this might be preferred. I have spoken of "wavy" surfaces. What I mean in distinguishing the glazed effect of the two surfaces— that of the field-surface and of the design-surface— is this: The reheating of the "field-surface," so called, when the plunger rises produces a surface which differs perhaps in degree of wavy appearance or polish from the so-called "design-surface," which is not a reheated surface, and that is the point which I mean to bring out by the use of the terms "wavy" and "not waved," as applied to these surfaces.     What I have spoken of as the "grid-like" formation, which holds the surface and prevents the same from being disfigured, may of course take the shape or form as indicated in the drawings, but what I mean by the use of the term "grid" broadly to indicate is such a formation, whether the same be made of raised or depressed lines and whatever the cross-section of those lines and whether such lines be continuous or broken into a series of short lines, as will serve during the process of forming the prism-light to hold the surface as described. Obviously there may be great variation in the form, the number, and the arrangement of the several lines or elements, raised or depressed, which are produced in my prism-light so as to bring about either one or the other, or both, of these results, or one or several of the various results alluded to hereinbefore.     I have spoken of the "receiving" side, but of course it will be understood that this term is simply used as a convenient term and not as a limiting term, since either side of the plate may be used as a receiving side. I have contemplated

making the design or the grid-like formation either as a single design to cover the whole or a part of the receiving-surface, or a series of distinct designs or a series of connected designs, or any other variation, as taste may dictate.     I claim—     1. A prism-light comprising a substantially flat and thin body of transparent material with a series of small prisms on one side thereof, systematically arranged to produce an increased illuminating effect and distributed in a substantially uniform manner over the prism side and a grid-like design on a part of the receiving side formed of lines produced in the transparent material and extending over a considerable portion of such receiving-surface, so as to leave no relatively large unbroken surfaces thereon, said lines formed of the substance of the prism-light.     2. A prism-light comprising a substantially flat and thin body of transparent material with a series of small prisms on one side thereof, systematically arranged to produce an increased illuminating effect and distributed in a substantially uniform manner over the prism side and a grid-like design on a part of the receiving side formed of lines produced in the transparent material and extending over a considerable portion of such receiving-surface, so as to leave no relatively large unbroken surfaces thereon, said lines formed of the substance of the prism-light and slightly elevated above the general surface of the receiving side.     3. A prism-light comprising a substantially flat and thin body of transparent material with a series of small prisms on one side thereof, systematically arranged to produce an increased illuminating effect and distributed in a substantially uniform manner over the prism side and a grid-like design on a part of the receiving side formed of lines produced in the transparent material and extending over a considerable portion of such receiving-surface, so as to leave no relatively large unbroken surfaces thereon, said lines provided with edges in planes substantially perpendicular to the receiving-surface, said lines formed of the substance of the prism-light.     4. A prism-light comprising a substantially flat and thin body of transparent material with a series of small prisms on one side thereof, systematically arranged to produce an increased illuminating effect and distributed in a substantially uniform manner over the prism side and a grid-like design on a part of the receiving side formed of lines produced in the transparent material and extending over a considerable portion of such receiving-surface, so as to leave no relatively large unbroken surfaces thereon, said lines of thin and of practically uniform cross-section, said lines formed of the substance of the prism-light.     5. A prism-light comprising a substantially flat and thin body of transparent material