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Patents: 181 of 511
UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF BROOKLYN, NEW YORK.

ILLUMINATING COMBINATION-TILE.
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Thaddeus Hyatt
65 of 67

SPECIFICATION forming part of Letters Patent No. 317,944, dated May 12, 1885.
Application filed April 6, 1885. (No model.)
To all whom it may concern:
    Be it known that I, THADDEUS HYATT, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented certain new and useful improvements in Illuminating Combination-Tiles, of which the following is a specification, reference being had therein to the accompanying drawings.
    My invention relates to the kind of combination-tiles made of fractional gratings, in which the disposition of the light-holes is such that on the fractions being put together the light-holes run crosswise to the tile on lines parallel with the junction sides of the gratings.
    The defect of the construction as hitherto made is that the light-holes bordering the junction sides of the fractional gratings have no flare on the under side, where they impinge against the junction borders of the grating, and as the junction lines that cross the under face of the combination-tile are in most cases but nine or ten inches apart, the result is that nearly or quite one-half of all the openings, when viewed from the under side of the construction, present the disfigurement of partially-splayed light-holes, the unsightly appearance of which detracts from the merit of the work and thereby lessens its value.
    For a clear understanding of why this defect exists in combination-tiles made of fractional gratings, with the light-holes so disposed therein as to run crosswise to the tile, I must explain that in order to produce a light-field in the combination-tile that shall have the unitary appearance of the light-field of the one-casting tile, it is necessary that the thickness of the line of dead material between the border rows of glasses at the junction edges of the fractional gratings shall be the same as that between the light-holes within the body of the gratings, respectively, which matter is fully set forth and illustrated in my Patent No. 315,4l2, dated 7th day of April, 1885,where the junction sides of the fractional gratings are shown as running parallel with the rows of light-holes. The result of this parallelism of the junction sides of the gratings with the run of the light-holes is to produce straight inflexible sides that cut away nearly the whole of the dead material from
the outside of the light-holes themselves where they impinge against the junction edges along the line of light-holes, the consequence of which is that no material and no room for splaying the holes properly on the under side is left.
    The object of my present invention is to obtain for the light-holes of the junction borders of the gratings the same amount of flare or splay as that of the other light-holes of the gratings without alteration of the thickness of the line of dead. material between the border rows of glasses at the junction edges thereof relatively to that of the lines of dead material between the rows of light-holes within the body of the gratings, respectively.
    My invention consists in making fractional gratings of the character hereinabove described, made with junction sides, the bounding-lines of which, instead of being inflexible and straight, are sinuous, and which, in place of conforming to the light-holes collectively as rows or lines, conform to them individually, following the curves or contour of the light-holes themselves, the sinuous junction seam formed thereby between the fractions being made up either of curved or of a succession of short straight lines, the curved lines forming a waved or serpentine seam, and time straight lines forming a serrated or zigzag seam, as will hereinafter more fully appear.
    Figure 1 represents a portion of a combination-tile at the line of junction where two fractional gratings meet. A indicates a portion of one fractional grating. B indicates another. A X indicate the border row of light-holes in A at junction-line. X B indicate the border row of light-holes in B at junction-line, a a indicate the junction edge of fraction A. b b indicate the junction edge of fraction B. c c indicate the joint seam between junction sides a and b. C D E are diagrams showing that the triangular grouping of the light-holes in the gratings is the same on the junction-lines as elsewhere.
    Fig. 2 represents a portion of a combination-tile at the line of junction where two fractional gratings made with my improved or sinuous junction sides meet to form the improved combination-tile.
    Fig. 3 is an enlarged cross-section of Fig. 1 on the line x x, and Fig. 4 is an enlarged cross-