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236,817 · Hyatt · "Illuminating-Grating or Perforated Plate of Metal and other Materials, and Constructions made therefrom" · Page 1
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Patents: 115 of 511
UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF NEW YORK, N. Y., ASSIGNOR TO
ELIZABETH ADELAIDE LAKE HYATT, OF SAME PLACE.

ILLUMINATING-GRATING OR PERFORATED PLATE OF METAL AND OTHER MATERIALS, AND CONSTRUCTIONS MADE THEREFROM.
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Thaddeus Hyatt
40 of 67

SPECIFICATION forming part of Letters Patent No. 236,817, dated January 18, 1881.
Application filed December 24, 1880. (No model.) Patented in England October 18, 1873, and March 4, 1874.
To all whom it may concern:
    Be it known that I, THADDEUS HYATT, of the city, county, and State of New York, have invented certain new and useful Improvements in Illuminating-Gratings or Perforated Plates of Metal and other Materials, and in Constructions Made Therefrom, with reference to fire-proofing and ornamenting the same, of which the following is a specification.
    The object of my invention is to make fire-proof illuminating roofs and surfaces and roof-pavements or area-coverings by constructing them of materials fire-proof in themselves or of materials made fire-proof.
    The illuminating roofs, surfaces, and area-coverings now in general use throughout the country are constructions devised by me as an application to new and useful purposes of my original invention of an illuminating-grating or perforated metal plate set with glass, patented by me as a vault-cover or coal-hole plate in the year 1845, as invented by me in the year 1834. These constructions are made of naked metal, and consequently are not strictly fire-proof, although incombustible.
    My present invention is the application of strictly fire-proof illuminating-gratings or perforated plates set with glass to the construction of illuminating-roofs, walking and other surfaces, and embraces the following novel points, to wit: First, fireproofed illuminating-gratings where glasses previously inclosed in mounts or jackets enter into the combination; second, glasses applied (either nakedly or set in mounts) to fireproofed metal gratings or plates after the fireproofing material has become set and hard; third, applying molded and hardened fireproofing materials to glass-set metal gratings or plates; fourth, ornamental fire-proof illuminating- surfaces formed of the above-named construction materials; fifth, glass-set mounts in the form of common bricks, and constructions therefrom made in the manner of ordinary brick constructions.
    The illuminating construction patented by me in England in 1869 as a "beam-platform," made of illuminating-gratings faced with asphalt, was fire-proof to the extent that
asphalt is a fire-proof material and to the extent that the application of the material to one surface only could make it, but by reason of its coating became possessed of three qualities not existing in my previous structures-- viz., first, fire-proof within the limits above stated; second, non-sweating to the extent of the covered surface; third, non-slipping. The concrete employed in the 1869 construction was a bituminous one.
    My present improvements have reference to obtaining the above-named three qualities in better shape by employing hydraulic cements, concretes, and baked clays, the invention consisting in making glass-set gratings of baked clays, or of Portland or other hydraulic cement, concrete, or material possessing hydraulic properties, or of glass-set metal gratings incased in fire-proofing material, and in constructions made therefrom, the novel features of the constructions being, first, a continuous surface of the incasing material, and on both the weather and house face of the roof or surface; second, in addition to the fire-proof quality, obtaining, as a result of covering both surfaces of the construction, security against the wrenching strains that now affect illuminating-roofs and roof-pavements covered with concrete or material on the weather-face only, where the naked metal of the under side is expanded by the hot atmosphere below it at a moment when the concrete or material without is feeling the effects of a winter's freezing cold.
    The aforesaid improvements were secured to me in England by Patents No. 3,380, October 18, 1873, and No. 783, March 4, 1874. In the former the invention is described in the form of cells and cell-quarries, the roofs or constructions formed by their union being honey-combed. In the latter the invention is described in the form of the ordinary illuminating-gratings or perforated metal plates in common use, the fireproofing materials employed to cover them consisting of baked clays or brick in plain and ornamental shapes, also fire-clay combined with asbestus and gelatinous silica, also hydraulic cements and concretes, employed and applied either according