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1499 · Hyatt · "Illuminating Gratings for Roofs, Areas, &c." · Page 1 Home  > Prism Glass  > Patent Index  > Page 1

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A.D. 1880, 12th APRIL. Nº1499. Illuminating Gratings for Roofs, Areas, &c. (This Invention received Provisional Protection only.)

Thaddeus Hyatt 39 of 67

PROVISIONAL SPECIFICATION left by Thaddeus Hyatt at the Office of the Commissioners of Patents on the 12th April 1880.     THADDEUS HYATT, of 21, Addison Gardens, N., Kensington, London, in the County of Middlesex. "IMPROVEMENTS IN THE CONSTRUCTION OF ILLUMINATING GRATINGS FOR ROOFS, AREAS, FOOTWAYS, AND OTHER PLACES, AND IN THE GLASSES FOR COMBINATION THEREWITH FOR ILLUMINATING PURPOSES."     As commonly made illuminating roof gratings and pavement lights for being walked upon are constructed by combining "pressed" glasses with the gratings, these glasses being handsomer in appearance than if cut from plates of glass, illuminating gratings made of equivalent pieces of rough plate being comparatively unsaleable, because of the untidy look of the rough edges of the glasses where they are broken from the plate; but plate glass is stronger and tougher than "pressed," on account of the superior method of its annealing. It is also desirable to be able to use plate glass in small pieces in combination with iron gratings where the glasses are fastened in with hydraulic cement, for the reason that hydraulic mortar or paste in setting gives out a large volume of heat, and when the glasses set by this cement are pressed glasses this heat tells upon the imperfectly annealed ones, many such existing always among pressed glasses because of the imperfection of their annealing, and liable to crack under the influence of the heat of the cement, thereby causing serious loss and annoyance. The object of my Invention is to produce for the market a saleable article of illuminating gratings made from pieces or fragments of cut plate glass set in the gratings by means of a fillet or overlap, which while concealing the rough edges of the glasses also serves to protect them in some degree from wear where the gratings are walked upon. This fillet I prefer to cast upon the grating, and then set the glasses from the opposite side, the fillet itself forming the seat for the glass. A part of my Invention in some cases consist in setting one or more glasses in a small chase or frame, and then combining these frames with the main grating. Another part of my Invention relates to prismatic pavement lights. In a vessel's deck the prismatic glass is unobjectionable, but placed over an area to light a dark basement room under the building the prism form is faulty, because one face of the prism is not only opposed to the reflecting one that sends its rays into the basement but in a degree interferes with it. To meet this difficulty my improvement, according to one method of procedure, consists