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Patents: 256 of 530	UNITED STATES PATENT OFFICE JACOB JACOBS, OF BROOKLYN, NEW YORK.	Jacob Jacobs 30 of 57
ILLUMINATING-TILE. SPECIFICATION forming part of Letters Patent No. 488,122, dated December 13, 1892. Application filed June 21, 1892. Serial No. 437,479. (No model.)

To all whom it may concern:     Be it known that I, JACOB JACOBS, a citizen of the United States, residing at Brooklyn, in the county of Kings, and in the State of New York, have invented certain new and useful Improvements in Lenses for Illuminating-Tiles, Vault-Covers, &c.; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to to the accompanying drawings, in which--     Figure 1 shows a top plan view of one of my lenses; Fig. 2, a vertical central section of the same, showing the lens as in place in a tile-frame; Fig. 3, a vertical central section of a lens with a different formation of the glass-inclosing jacket, and Fig. 4 a top plan view of a lens with the jacket formed as shown in full lines in Fig. 3 and a base made square with corners cut off.     Letters of like name and kind refer to like parts in each of the figures.     The object of my invention has been to provide an improved lens for use in illuminating-tiles, vault-covers, &c.; and to this end it consists in the lens and the parts thereof constructed, arranged, and combined as hereinafter set forth.     In the drawings, A designates the body of the glass part of the lens, and A' the base thereof, which, as in lenses heretofore made, is constructed of greater diameter than said body and can be round, as shown in Fig. 1, square with corners cut off, as shown in Fig. 4, or of any other desired shape.     The body A is provided with one or more spiral or inclined screw-threads a a to engage correspondingly-shaped thread or threads on the inner face of the jacket C, so that the latter can be screwed down upon said body. Such jacket is preferably made of sheet metal, which can be brass, iron, tin, copper, aluminum, lead, galvanized iron, zinc, or other metal; but it can, if desired, be formed instead of gutta-percha, celluloid, earthenware, or any other desired material. When it is made of sheet metal or other thin substance, the desired thread or threads c c on it can consist, as indicated in the drawings, of suitable corrugations to correspond with the ribs and depressions on the body A.

The upper edge of the jacket is preferably made to extend inward over a portion of the upper part of the lens-body in the manner indicated in full lines in Figs. 1, 2, 3, and 4, or it can be caused to stand upright and simply embrace the cylindrical top of said body, as shown in dotted lines in Fig. 3.     In Figs. 1 and 2 the jacket has around its upper edge an abrupt inwardly-turned lip c', which engages the bottom of an annular rabbet a' in body A, which is preferably deeper than the lip is thick, so that the top of the latter forms no part of the "walking-surface." The lower end of the jacket has an outwardly and downwardly extending flange or lip c², extending over a correspondingly outwardly-inclined face a², connecting the outer face of body A with the projecting base A'.     In the lens shown in full lines in Fig. 3 there is no rabbet a' in the body; but the upper edge of the latter is rounded or beveled off and the upper end of the jacket is inclined inward to embrace a portion of the rounded or beveled part, but preferably stops short of the upper face of the glass. The top of the base A' and the flange c² on the jacket extend out substantially at a right angle to body A. As the engaging threads on said body and jacket will securely hold the two from up or down movement with reference to each other and the lower end of the jacket engaging the base. A' effectually limits the downward screwing of the jacket, the inturned lip at the upper end of the latter can be dispensed with, if desired, and the jacket can be above its thread, carried up vertically so as to inclose a cylindrical part of the lens, in the manner indicated in dotted lines in Fig. 3.     Instead of having the outturned flange at the lower end of the jacket, I contemplate, where it is desired, providing the base with an annular depression a³ in its top, into which the jacket will project when screwed down into place around the body A. (See Fig. 3.)     In order to make a close water-tight joint between the inner and outer faces of the jacket and body, respectively, I have a thin layer c³ of white or red lead, cement, or other waterproof material between such faces. This layer can be easily secured by coating