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Patents: 80 of 511
UNITED STATES PATENT OFFICE
THADDEUS HYATT, OF NEW YORK, N. Y., ASSIGNOR TO
ELIZABETH A. L. HYATT, OF SAME PLACE.

IMPROVEMENT IN NON-CONDENSING ILLUMINATING VAULT-COVERS.
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Thaddeus Hyatt
33 of 67

Specification forming part of Letters Patent No. 145,206, dated December 2, 1873; application filed October 22, 1873.
CASE 11.
To all whom it may concern:
    Be it known that I, THADDEUS HYATT, of New York, in the county of New York and in the State of New York, have invented certain new and useful Improvements in Non-Condensing Illuminating-Gratings; and do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making a part of this specification, in which--
    Figure 1 is a plan view of the upper side of a section of an illuminating-grating or roofing-plate of my improved construction, and Fig. 2 is a vertical section of the same.
    Letters of like name and kind refer to like parts in each of the figures.
    The design of my invention is to produce an illuminating plate or grating for roofing or other like purposes, which shall be protected upon its lower side against the condensation of moisture; to which end it consists in a metal plate provided with glazed illuminating-openings, covered upon its lower side with wood or other suitable non-conductor of heat and cold, and having the lower edges of said illuminating-openings covered with rings of felt or other like absorbent material, substantially as and for the purpose hereinafter specified.
    In the annexed drawing, A represents a metal plate, made, preferably, thin and flexible and covered upon its lower surface with a sheathing of wood, B, which latter is also thin and easily bent. At suitable points upon the plate A are provided illuminating-openings, a, each of which contains a glass lens, C, that has, preferably, an enlarged head and threaded shank, and is held in place by means of a nut, D, which engages with said threaded shank, and bears against the lower surface of the wooden sheathing, so as to confine the latter closely upon said plate A.
    The wooden sheathing, being a non-conductor of heat and cold, prevents the condensation of moisture upon the lower side of the plate A during sudden changes in the temperature of the external air.
    If desired, the capacity of the sheathed grating to resist the transmission of heat and
cold may be materially increased by placing between the plate A and wooden sheathing B a lining of felt or other fibrous material, E.
    A certain amount of moisture will condense upon the lower side of each lens C, and in order that the same may be prevented from dripping downward, I make the lower surface of each lens concave, so as to cause said condensed moisture to pass outward and downward to the edge thereof, and within the lower side and inner edge of each nut I provide an annular groove or recess that is filled with felt or other absorbent material d, which felt absorbs the said drip and causes the same to be diffused through its whole body and brought into such contact with the air as to cause it to become dissipated therein.
    In case the lens is constructed so as to be secured in place without the use of the nut D, the felt may be attached to or upon the wood casing at the edge of each illuminating-opening, where it will perform the same office, as before described.
    The grating described is intended more especially for use in places where little weight is required, and where it may be necessary to bend the same, in order to conform it to the angles or curves of the roof-lines; but it will be readily seen that the principle involved in the protecting of the lower surface of the metal and in dissipating the drip of the lenses, is equally applicable to a rigid grating.
    Having thus fully set forth the nature and merits of my invention, what I claim as new is--
    A metal plate provided with illuminating-openings, covered upon its lower side with a casing of wood or other suitable non-conductor of heat or cold, and having the lower edges of its said illuminating-openings covered with rings of felt or other like absorbent material, substantially as and for the purpose specified.
    In testimony that I claim the foregoing I have hereunto set my hand this 26th day of July, 1873.
THADDEUS HYATT.
Witnesses:
    AMBROSE MONELL,
    CHARLES SPYR.