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1499 · Hyatt · "Illuminating Gratings for Roofs, Areas, &c." · Page 2
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2 A.D. 1880.--Nº 1499.  

Hyatt's Impts. in the Construction of Illuminating Gratings for Roofs, Areas, &c.

in serrating the objectionable slope of the prism with steps or teeth formed with perpendicular or nearly perpendicular sides, the rays from the opposite reflecting slope then passing freely through the serrated side into the dark basement room without obstruction, while according to another method of procedure I form the serrated slope of the prism with steps or teeth, each one of which is composed of a straight or perpendicular face and a reflecting sloping one behind it. Prismatic glasses thus made I prefer to form with but one serrated slope, all the reflecting inclines of which face the apartment to be lighted. By another method of procedure I utilize both reflecting surfaces of the prism and produce a still better result than by the foregoing methods. According to this part of my Invention I combine a daylight reflector with prism glasses, and thus send into the dark basement the light from both the direct and opposing faces of the reflecting prism surfaces. In carrying my Invention into effect I prefer to make use of a number of reflectors, preferable in the form of slats or strips of about a foot long and from three to six inches wide, placed as near to the prisms as possible in practice, and of preference on two or more levels, the one breaking joints with the other. The combination of sectional daylight reflectors and illuminating gratings, the objection to which as commonly made for being walked upon is the button-like shape of the glasses, and my improvement consists in shaping the face of the lenses to present more flat surface, and this less obnoxious to the feet of pedestrians, which I effect by making the lens surface in the form of an arch, the under face being also arched but crosswise to the upper. These glasses I make either with single lenses or lenses in clusters upon a plate of glass in manner similar to the common ones, combining them with the gratings in the ordinary way. Another part of my Invention relating to illuminating gratings as walking and roof surfaces consists in combining the glasses with either a cast grating or a perforated plate or sheet of wrought metal formed with wedge shaped crimps or corrugations, which I fill with cement, concrete, or other suitable and cheap material, in which I set the glasses. In carrying this part of my improvement into practice I set the glasses within the channels or corrugations, placing each one within or over a light hole, and there surround it with the cement or material that fills the corrugations. Another part of my Invention relates to illuminating gratings as pavement lights, the foot surface of which is a combination of glass, cement, and metal, the cement being the safe or foot holding material in the combination. As usually made the cement forms proportionately too small a part of the surface to produce the best effects, and my improvement consists in forming the edges of the glasses with indents where they take their bearing in the gratings, which increases the area of the cement and the safety of the surface; where the grating is not flat but studded with knobs of iron for safety, my improvement consists in making them safer by means of bits of rope on end, preferably boiled previously in rosin, inserted within the knobs, which are made hollow to receive them.
Printers to the Queen's most Excellent Majesty.
For Her Majesty's Stationery Office.