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of the concrete shown in Fig. 2 and indicated as E.
    I am aware that heretofore efforts have been made by those who have been working in this art to overcome the difficulties which are found to arise from the uneven expansion and contraction of the elements which go to make up the tile as at present constructed, resulting oftentimes in the cracking of the glass or the breaking of other portions of the tile. The object of my present invention is to interpose between these elements in such relation as may accomplish the best results a soft or elastic substance, such as lead, in such form and in such relation to the parts as to permit an expansion and contraction which under normal conditions exist, and yet to provide a compensation for such expansion and contraction that will overcome the difficulties heretofore encountered-that is to say, the cracking of glass or the disturbance of the normally rigid relation of the parts. To this end I have constructed the triangular piece of metal C, which is intended to fit between the braces, say at a6 and a4, with its sharp edge a5 hearing against the glass. The advantages of this arrangement are, first, that these blocks C form a bearing and support for the lens B when the concrete or cement is being introduced; second, that when the concrete is introduced and expansion or contraction occurs of any or all of the parts or elements of the combination making or forming the complete tile the soft-metal wedge C will yield to such pressure in a manner to relieve the strain and permit the tile to remain an integral whole, and I present to the glass the edge a5 with the idea that it is the most delicate portion, and consequently any pressure upon it will he more readily relieved by the yielding of the soft edge a5.
    In order that the utility of my invention may be fully understood, it must be remembered that illuminating-tiles such as that which I have described are made with the use of gratings having four or more walls, which are usually two or three feet one way and five or six feet the other. Of course they may he made of any size or form; but in all cases
they are made with inclosing walls, such as a8 and a9. When the cement is introduced, therefore, it becomes a solid mass between the walls of the grating surrounding the lenses and having its bearing and hole on the braces, as a' to a6 &c. The object that I have in view is to interpose at preferably the intervals indicated as above a substance, such as lead, throughout the entire mass of concrete or cement, in order that said substance may act as a yielding element throughout the entire mass. It will be understood, therefore, that the concrete lying between the walls, as c3 c4, &c., in its expansion will find a yielding body to such expansion, and in like manner when the lens expands it will find in the lead a yielding edge, and so the whole union of the parts of the tile will he dependent one upon the other, and the uneven expansion will be compensated for by the elasticity and softness of the lead or equivalent material interposed as part hereof. I prefer to make the lead piece C of an elevation somewhat less than that of the rim of the grating, such as a8, so that when the plastic cement is introduced it will cover the lead; but I do not intend that it shall cover it to any material depth, and I may bring the lead to the surface-- that is to say, in a plane with the top of the rim a8 and the lens B, as shown in Fig. 2.
    What I claim is--
    As a new article of manufacture a translucent tile formed of a grating with walls, braces and light-holes, and glass lenses set into said light-holes, and triangular pieces, of lead or equivalent elastic material interposed between the braces and the glass with the sharp edge of the piece bearing on the glass, and the space within the walls of the grating filled in with cement, substantially as described.
    Signed at New York, in the county of New York and State of New York, this 11th day of August, A.D. 1896.
DAVID G. BEECHING.
Witnesses:
    WILLIAM W. SEÜFERT,
    THOMAS P. DALTON.