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John M. Ewen
1 of 21
SPECIFICATION forming part of Letter Patent No. 583,594, dated June 1, 1897.
Application filed November 23, 1896. Serial No. 613,130. (No model.)
To all whom it may concern:
    Be it known that I, JOHN M. EWEN, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Prismatic Lights, of which the following is a specification.
    My invention relates to prismatic lights, particularly such as are designed to be used in lieu of window-lights for the purpose of receiving, admitting, and distributing in a proper manner the light on the outside of a building which it is desired to use within. I have found in some extended investigations of prismatic light that for certain purposes one angle of the prism will be most desirable, while for other purposes some other angle may be better; but I also find that for the most part the most desirable form of prism is that in which one edge is substantially at right angles to the surface of the glass, while the other is considerably inclined thereto. In the use of prisms, and even in the use of the prism I have last described, a considerable portion of the light which passes through the same is diffused generally, so to speak, instead of being directed forward, as is desired. Such prismatic lights are commonly used for the purpose of directing the light in lines parallel with the ceiling into and through the apartment to be lighted. Now a single prism, such as that shown, will do this to a considerable degree, but a considerable amount of light will also pass through, and, as previously suggested, be generally diffused or distributed and not be carried on the direct or forward line along with the greater portion of the light, so to speak. This appears to be true with substantially all forms of prisms, though perhaps some angles might be used in which this difficulty would not occur. Some forms of prisms, however, are difficult to make and difficult to preserve. I find, now, that by placing in association with such prismatic light a second prismatic light the greater part of these rays of light, diffused as suggested, are gathered up and directed into such parallel lines. In other words, two of these prismatic lights under the ordinary conditions of use, when arranged as suggested, will greatly increase the illumination of the interior of the
room. These results will follow to a greater or less degree from the use of many kinds of prisms, and the prisms need not always perhaps be the same, but I find that very excellent results flow from the use of double prisms where both have the perpendicular edge, and that very excellent results flow from the use of double prismatic lights where the inclined angle is about that shown in the drawings, and that very excellent results flow from the use of double prismatic lights where both are the same. The best form of my invention therefore appears to be that in which I use two prismatic lights placed in substantial parallelism with each other, each having a series of prisms thereon shaped substantially as shown above and being practically the same in shape. These two sets of prismatic lights may be placed in fixed and permanent relation to each other, or they may be hinged together, so that they may be used either double or single, as the ease may be or as occasion may seem to require.
    My invention is illustrated in the accompanying drawings, wherein--
    Figure 1 is a cross-section through two sheets made up each of a series of sections of prismatic lights. Fig. 2 is a plan view of the same, and Fig. 3 is an end view of two sheets of prismatic lights hinged together.
    Like letters indicate like parts in the several views.
    The sections are indicated by the letters A A, the prisms by the letters B B, and the surrounding sash or frame by the letter C. D is the hinge. These several sections of prismatic glass may be secured together in any desired manner and framed up in any desired frame, so as to constitute, when finished, a filled window-sash, so to speak. Two of these then are placed as indicated and permanently associated in a surrounding fixed sash or frame, or they may be hinged together, as shown, one being fixed in the window in any desired manner and the other being hinged thereon.
    The object of hinging the sections or lights together is in part to enable the user to employ one window-light and throw the light admitted therethrough into a certain part of the room or diffuse it in a certain manner,