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206,571 · Hyatt · "Improvement in Modes of Covering, Lighting, and Ventilating Areas, Vaults, &c." · Page 2
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asphalted parts, this asphalt being natural, and, as seen in Fig. 8, rising to the level of the glasses, which are represented as flat-faced, but may be slightly convex.
    Fig. 9 represents in plan, and Fig. 10 in cross-section, another form of cellular face, made by cross-ribs i i, the glasses E E being held by the asphalt filling, (shown by the dotted shaded parts,) and the asphalt being held by the metal cross-bars i i. A model of this invention was sent to the Patent Office at Washington, D. C., by me about the years 1850-52, and remained in the model-room until the first clearing-out sale of models. I also made illuminating-gratings of this kind, except that
the metal bars i i formed a portion of the walking-surface, in combination with the glasses and asphalt, and put them to use in the city of New York about that time.
    Having thus fully set forth the nature of my invention, what I claim, and desire to secure by Letters Patent, is--
    An illuminating-surface composed of glass and asphalt, substantially as and for the purposes described herein, and illustrated by my drawings.
THADDEUS HYATT.
Witnesses:
    T. C. BRECHT,
    O. E. DUFFY.