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UNITED STATES PATENT OFFICE
CHRISTIAN HANSEN ROSS, OF CHICAGO, ILLINOIS, ASSIGNOR TO
THE DAUCHY IRON WORKS, OF SAME PLACE.

VAULT-LIGHT.
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Christian H. Ross
3 of 3

SPECIFICATION forming part of Letters Patent No. 410,380, dated September 3, 1889.
Application filed April 29, 1889. Serial No. 309,088. (No model.)
To all whom it may concern:
    Be it known that I, CHRISTIAN HANSEN ROSS, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Vault-Lights, which is fully set forth in the following specification, reference being had to the accompanying drawings, in which--
    Figure 1 represents a plan view of a construction embodying my invention, portions thereof being broken away to show the construction; Fig. 2, a sectional view taken on the line 1 1 of Fig. 1; Fig. 3, a bottom plan view of one of the glasses detached, and Fig. 4 an elevation of the same.
    Like letters refer to like parts in all the figures of the drawings.
    My invention relates to vault-lights, and has for its object to provide a construction whereby the glasses or lights proper may be caused to fit snugly within the light-holes provided for them in the cast bed-plate or frame.
    In that class of vault-covers to which my present invention relates an iron base-plate or frame is cast with circular light-holes, within which the circular glasses are intended to fit with sufficient snugness to prevent their turning or slipping, being afterward secured by a suitable cement or other similar means. These circular light-holes are frequently irregular in outline, owing to imperfections in the casting arising from various causes, and when this is the case it is obvious that the circular glasses will not fit within them in case the irregularity reduces the diameter at any point. This necessitates in practice expensive mechanical manipulations in truing the light-hole to permit the introduction of the glasses. It is the object of my present invention to overcome these objections and to produce a glass which will adapt itself to the irregularities of the light-holes, so as to have a lateral bearing at three or more points to prevent its slipping or rotating, thereby doing away with the necessity of truing the light-holes, while at the same time a snug fit is obtained.
    I will now proceed to describe a construction in which my invention is practically carried out in one form, and will then particularly
point out in the claims those features which I deem to be new and desire to secure by Letters Patent.
    In the drawings, A represents the bed plate or frame, which, as herein before stated, is of cast-iron, provided with the light-holes a. Each of these light-holes a is provided near its lower portion with an internally-projecting circular ledge or flange a', upon which the glass rests and is supported vertically.
    The glasses are represented at B, and are circular in form, but of a diameter somewhat less than the main diameter of the light-holes a, although of a greater diameter than the contracted portion of these light-holes, caused by the ledge or flange a', so that when in position they will rest upon the said ledge or flange and close the light-holes, as shown in Figs. 1 and 2. These glasses are preferably provided with the usual shoulder b, to enable the cement to hold them more firmly in position.
    Extending radially outward from the body of the glass B are a series of projections B', of such length that the total diameter of the glass, measured through these projections, will be equal to the diameter of the light-hole a, or, more properly speaking, to the diameter which it should have if properly constructed. In the present instance I have shown six of these projections; but it is obvious that their number may be varied as desired, and that their form may be other than that shown. Their height is preferably equal to the height of the portion of the glass below the shoulder b.
    D represents a filling of cement or other suitable material, which is applied after the glasses B are placed in position, and finished off about level with the top of the glasses to make a smooth surface, the said cement serving to hold the glasses firmly in one position and present a good walking-surface for pedestrians.
    In placing the glasses B in position it will be seen that if the light-holes a are properly constructed the glasses B will fit snugly therein, having a lateral bearing all around against the side wall of the said holes. If, however, the said holes are irregular, as is frequently the case, the glass maybe so turned that those