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Patents: 394 of 530	UNITED STATES PATENT OFFICE. JOHN MEIGGS EWEN, OF CHICAGO, ILLINOIS, ASSIGNOR TO THE LUXFER PRISM PATENTS COMPANY, OF SAME PLACE.	John M. Ewen 17 of 21
PRISMATIC WINDOW. SPECIFICATION forming part of Letter Patent No. 595,263, dated December 7, 1897. Application filed October 2, 1897. Serial No. 653,782. (No model.)

To all whom it may concern:     Be it known that I, JOHN MEIGGS 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 Windows, of which the following is a specification.     My invention relates to prismatic windows, and has for its object to provide a new and improved window of this description.     My invention is illustrated in the accompanying drawings, wherein—     Figure 1 is a view of a prismatic window embodying my invention. Fig. 2 is a section through the same. Fig. 3 is a front view showing a modified form of my device.     Like letters refer to like parts throughout the several figures.     When the window to be provided with prism-lights is set at a distance back of the wall of the building or, in other words, is provided with a deep reveal, the light is obstructed by the wall, and the efficiency of the prism-lights is very much reduced. Moreover, the arrangement of these prism-plates is liable, under certain conditions, to interfere with the architectural effects of the building, and it is a part of my invention to so arrange them as that they are "detached," so to speak, from the scheme of architecture and do not therefore interfere with those effects. Again, in the manufacture of prism-plates it will be observed that we use certain factors or elements which under existing conditions consist of prism-lights four inches square. It will be therefore seen that any attempt to fit the window-opening exactly and to provide for all emergencies would require a large number of small pieces or factors, but these are difficult to make, require large stocks to be kept on hand, and also destroy the harmony or uniformity of the finished plate, and it is a part of my invention therefore to arrange so that standard sizes of these prism-lights can be made and be thus applied to the various windows, a great or less margin being left about the edge in each case. Again, it is often highly important, if not essential, to arrange these window-plates so as not to interfere with the action of the ordinary window and not to disturb or prevent ventilation

by the ordinary window and not to prevent the washing or cleaning of the ordinary window. These objects are also accomplished by my invention. I have called this firm-plate when so applied a "forilux." In order to avoid these difficulties and to produce the results hereinafter mentioned, I suspend a prism-plate A at a distance from the window B instead of placing the prism-lights directly in the window. This prism-plate is preferably of such dimensions that a space C will be left all around its edges, so that the appearance of the building will not be changed and so that the deep reveals will show. This also allows proper ventilation to be obtained by manipulating the window B. I prefer to suspend the prism-plate A approximately in the plane of the outer face of the wall D; but it is of course evident that its position may be varied somewhat, if desired, though of course it should not be placed far enough within the reveal to prevent the proper amount of light from falling upon it.     As shown in Fig. 1, I have suspended the prism-plate by means of a series of supports E, placed at intervals around the plate.     In Fig. 3 I have shown the prism-plate as suspended from the cross bar or rod F, located near the top of the window. The plate is preferably pivotally or movably connected with this rod or the rod movably mounted in bearings, the lower part of the prism-plate being held in position by the holding-pieces G. This latter construction provides a very simple, efficient, and artistic means for holding the prism-plate in position.     It will be seen that by placing the prism-plate as herein indicated little or none of the light will be constructed by the walls of the building. It is of course evident that the position of the prism-plate may be varied and that the mode of suspension may also be varied. attempted to illustrate all the uses of my invention, for such uses will be readily understood from the foregoing description. I therefore do not wish to be limited in any manner by the construction shown.     I have not attempted to set forth the various details of construction of the several parts, as they will reading occur to those versed in the art, and I have simply attempted to show diagrammatically, as it were, a construction embodying my invention and which will make its application clear.     I claim—     I claim—