 Up: Patent Index |
3271 · Hyatt · "Improvements in Glasses or Lenses for Pavement and other Lights" · Page 2 Home > Prism Glass > Patent Index > Page 2 |
 3,271: 2 of 4 |
|
Up: Patent Index |
3271 · Hyatt · "Improvements in Glasses or Lenses for Pavement and other Lights" · Page 2 Home > Prism Glass > Patent Index > Page 2 |
3,271: 2 of 4 |
SPECIFICATION in pursuance of the conditions of the Letters Patent filed by the said Andrew McLaren in the Great Seal Patent Office on the 26th January, 1882. ANDREW McLAREN, of Upper Thames Street, in the City of London, Iron Founder. "IMPROVEMENTS IN GLASSES OR LENSES FOR PAVEMENT AND OTHER LIGHTS." The object of this Invention is the formation of pavement and like lenses or prisms by moulding (with or without pressure) fluid glass with rounded front surface and rounded bottom edge, in order to obtain a better concentration of light therein and a maximum of reflection therefrom; also a better and wider spread diffusion of rays than by the flat sided and square bottom edged lenses now used. The front surface of my lens is of a convex shape, and tapers from the stock to the bottom edge, which is also convex, the back of the lens or prism being plane, but set at an angle from the shoulder, so that a reverse reflection of light is diffused in the opposite direction to that from the front, in consequence of which the portion of light which is concentrated in the lens of present construction and is therein held, is by my Invention deflected at angles from one face different to the angles taking place radially from the lower edge, which is curved or of convex shape. The annexed Sheet of Drawings clearly represent my Invention at Figures 1 and 2, which show respectively a side and a front elevation, Figure 3 showing a series of my lens in a frame, such as is fitted in pavements for lighting up cellars or underground rooms to enable gas light to be dispensed with in the day time. A is the tread or stock; B, the shoulder; C, the front face with a projecting lip D, giving great thickness at the upper portion where the arc of concentration is formed, and to ensure a diffusion of the whole of the light so concentrated through the lower thinner portion of varying degrees of intensity according to the diminishing thickness to the lower edge E, where a further distribution of rays radially downward escape. I am aware that plane surfaced lens with a great thickness at the upper part and a tapering to the lower with the angle on one or on both sides for the concentration and diffusion of light in underground rooms have been used, I therefore make no claim to such lens, but having described the nature of my said Invention I do claim,-- The rounded front faced and rounded bottom edged lens, as shown in the annexed Drawings, whereby is obtained a more precise concentration of light and a greater diffusion varying in intensity with increased brilliancy, as described. In witness whereof, I, the said Andrew McLaren, have hereunto set my hand and seal, the Twenty sixth day of January, in the year of our Lord One Thousand eight hundred and eighty two.
Printers to the Queen's most Excellent Majesty. For Her Majesty's Stationery Office. 1882. |