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Patents: 485 of 511
UNITED STATES PATENT OFFICE.
CHARLES E. MANNING, OF CHICAGO, ILLINOIS.

First: 618,280 · Manning · "Window and Light-Reflecting Device" · Page 1 Last: 631,220 · Manning · "Illuminating Window-Glass" · Drawing Prev: 618,280 · Manning · "Window and Light-Reflecting Device" · Page 1 Next: 631,220 · Manning · "Illuminating Window-Glass" · Page 1 Navigation
Charles E. Manning
2 of 3
ILLUMINATING WINDOW-GLASS.
SPECIFICATION forming part of Letter Patent No. 622,506, dated April 4, 1899.
Application filed April 23, 1898. Serial No. 678,638. (No model.)
To all whom it may concern:
    Be it known that I, CHARLES E. MANNING, 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 Illuminating Window-Glass; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.
    My invention relates to improvements in illuminating window-glass for windows, transoms, skylights, and the like, and has for its object to provide an illuminating-glass which possesses good light-reflecting and light-refracting qualities and combines cheapness with utility.
    My invention comprises an illuminating-glass made up of a number of narrow strips of flat window-glass fitted together in such manner as utilize the reflecting and refracting qualities thereof to the best advantage and contemplates the use of waste cuttings from large plates of glass.
    Reference is had to the accompanying drawings, wherein the same parts are indicated by the same letters throughout the several views.
    Figure 1 represents a view in elevation of a window-light fitted with an illuminating-glass constructed according to the simplest form of my invention. Fig. 2 is a vertical section taken on the line 2 2 in Fig. 1. Fig. 3 is a perspective view illustrating the manner in which the strips of glass are built up one upon another, parts of the said strips being broken away for the sake of better illustration. Fig. 4 is a sectional view similar to that shown in Fig. 2, but illustrating a slight variation of the manner of arranging the strips. Fig. 5 represents a detail view in section, similar to Figs. 2 and 4, enlarged, showing the strips as having angular edges upon the light-discharging side of the illuminating-glass. Fig. 6 represents a detail view, also enlarged and in section, illustrating the use of interposed opaque reflecting strips or substances between the adjacent faces of the strips of glass where such opaque reflecting mediums are necessary to obtain best results in illuminating. Fig. 7 represents a detail view, also in
section and enlarged, showing thin plates of ordinary window-glass fitted over the edges of the strips upon the light-receiving and light-discharging faces of the light. Fig. 8 represents a similar view showing a plate of ordinary window-glass fitted upon the light-receiving face of the window-light only. Fig. 9 is a similar view showing the strips of glass as having beveled inner edges. Fig. 10 represents a detail perspective view of an arrangement for an angular panel or illuminating-glass. Fig. 11 is a perspective view of an arrangement for a curved panel; and Fig. 12 is a diagrammatic view illustrating the direction of reflection or refraction of a ray of light entering one edge of a sheet of glass, according to the angle of incidence.
    In the simplest form of my invention (shown in Figs. 1 and 2) the illuminating-panel is made up of a number of rectangular strips of ordinary glass A, of greater width than thickness, built up together with their faces adjacent and their width constituting the thickness of the illuminating-panel, the whole being mounted in a suitable frame or sash B. The width of the said individual strips, and therefore the thickness of the panel, bears the ratio of at least two to one to the thickness of the individual strips, as seen in the said figures. The exact measure of light distribution is a question of the thickness of the finished panel relative to the thickness of the individual strips—that is to say, the width of the composing strips relative to their thickness. It is known that a ray of light traveling in a glass medium and approaching a surface at an angle greater than a certain fixed angle will pass out through that face; but if the angle be less than that certain fixed angle the ray of light will be internally reflected and will return in the glass medium, the angle of reflection being equal to the angle of incidence. Thus, referring to Fig, 12, if a ray of light taking the direction shown by the full line X enters the plate of glass P through one edge and approaches the lower surface thereof at an angle less than the critical angle it is internally reflected, as shown at X'; but a ray of light (indicated by the dotted line Y) approaching the same surface of the plate at an angle greater than the critical angle will