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586,258 · Winslow · "Prism-Light and Prism-Plate" · Page 1
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586,258: 1 of 5

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Patents: 362 of 511
UNITED STATES PATENT OFFICE.
WILLIAM H. WINSLOW, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE
LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.

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William H. Winslow
9 of 12
PRISM-LIGHT AND PRISM-PLATE.
SPECIFICATION forming part of Letter Patent No. 586,258, dated July 13, 1897.
Application filed March 24, 1897. Serial No. 628,997. (No model.)
To all whom it may concern:
    Be it known that I, WILLIAM H. WINSLOW, 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 Prism-Lights and Prism-Plates, of which the following is a specification.
    My invention consists in prism-lights and prism-plates made from such lights, and has for its object to produce prism-lights having smooth unbroken surfaces on the plane side, and prism-plates having smooth unbroken surfaces on the plane sides, as more fully hereinafter explained and described.
    Figure 1 is a plan view of the plane side of the prism-light. Fig. 2 is a cross-section through the same. Fig. 3 is a plan view of a prism-light; Fig. 4, a cross-section through the same. Fig. 5 is an edge view, and Fig. 6 a plan view, of my finished and improved prism-light. Fig. 7 is a plan view of a finished prism-plate; Fig. 8, a plan view of the same before the plate has been finished; Fig. 9, a cross-section of Fig. 8. Figs. 7, 8, and 9 are on a smaller scale than the others, and Figs. 8 and 9 illustrate the prism-plate when it is to be subjected to a different treatment.
    Like parts are indicated by the same letter in all the figures.
    A is the edge, rim, or border of a prism-light, and it should be of uniform thickness.
    B is the central depressed surface of the light, and C is the raised surface of such light.
    D is the line of separation between the edge or border and the central surface, and it is frequently in the form of a sort of groove. (Not easily shown in the drawings, but very noticeable in the product.)
    The object of the prism-lights is to introduce light into rooms and properly direct or control it, and therefore, of course, such prisms are to be used in high-grade buildings and as fronts in expensive shops and on great thoroughfares. Smooth and perfect finish is therefore of the greatest importance, since the prism-plates are intended practically to take the place of plate-glass.
    In the prism-lights heretofore formed the prisms did not ordinarily
extend to the outer margin of the plate, but a rim was left, and then the prism-lights were assembled to form a prism-plate, being united by the lead mountings, such as are commonly employed in stained-glass and ornamental work. In forming these prism-lights the molds were constructed so that the bounding-line of the prism area coincided with the groove or indentation D, and therefore such groove was unnoticed and negligible. Now, however, the prisms extend to the outer edge of the body of the prism-light in every direction, so far as that may be possible, and hence if the groove be suffered to remain it appears as a line or lines running across the prisms and disfiguring the product, rendering it to a degree undesirable for the work for which it is intended. In the ordinary process of molding, however, it is impossible to avoid this groove-like appearance, or at least to avoid an irregular and unsatisfactory surface, as indicated in the drawings. In ordinary practice the central surface is sometimes elevated above and sometimes depressed below the surface of the surrounding rim or border. The surrounding rim or border is kept of uniform thickness, so as to make the application of the prism-light to its frame easy and satisfactory, and this uniformity is particularly desirable when the prism-lights are to be mounted into prism-plates by my electroglazing method.
    E E are the prisms and F the smooth uniform finished surface of the body G of the prism-light. In applying my method and producing my product I arrange the molds so that every prism-light formed will have a central surface C projecting above the surface of the border A instead of being in any instance depressed below, as is the surface B. In other words, I make the departure from the surface uniformity desired always positively in the direction of an excess of material or an elevation of surface on that part of the prism-light surface which does not coincide with the surface of the border or edge. These prism-lights are then subjected to a grinding or polishing treatment, which removes the excess, reduces the surface to uniformity with the surface of the border, and