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288,571 · Hyatt · "Vault-Cover or Illuminating Grating-Tile and Surface Made Thereof" · Page 2
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    6. A perforated plate or grating-tile formed with parallel ranges of light-holes, the light-holes being placed end to end, with buttons or knobs between the ends, the light-holes of each range breaking joints with the light-holes of the ranges immediately on each side of it, so that the buttons or knobs between the ends of the light-holes in such ranges on each side of it become protectors at the sides as well as at the ends of the light-holes.
    7. A perforated plate or grating-tile formed with parallel ranges of light-holes, the light-holes being placed end to end, with buttons or knobs between the ends, the light-holes of each range breaking joints with the light-holes of the ranges immediately on each side of it, so that the buttons or knobs between the ends of the light-holes in such ranges on each side of it become protectors at the sides as well as at the ends of light-holes, in combination with
glasses cemented or fixed within such light-holes.
    8. As a new patent-light material for manufacturing illuminating-gratings, an oval lens, properly shaped and proportioned for combination with metal gratings to be set with glass for illuminating purposes.
    9. As a new patent-light material for manufacturing illuminating-gratings, an oval lens formed upon an oblong base, properly shaped and proportioned for combination with metal gratings to be set with glass for illuminating purposes.
    In testimony whereof I affix my signature in presence of two witnesses.
THADDEUS HYATT.
Witnesses:
    T. C. BRECHT,
    ALEX. SIMON.