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11,072 · Basquin · "Improvements in Vault Lights or Prism Tiles" · Page 3 Home  > Prism Glass  > Patent Index  > Page 3

11,072: 3 of 5

3 Nº 11,072.--A.D. 1897.   Basquin's Improvements in Vault Lights or Prism Tiles.     5. A prism tile comprising a part with a substantially plane receiving surface and a projecting prism having one curved surface and one plane surface, the curvature of such surface and the character of the other prism surface being such that part of the rays of light falling upon the receiving surface from a given direction will be so treated successively by the prism surfaces as to be converged substantially along a line a little farther below the plane of the receiving surface than the lower line of such prism and in advance of the lower line of such prism by a distance about equal to the greatest width of such prism in the direction in which the light is to be thrown, and the remainder or the rays will be directed into horizontal lines.     6. A prism pavement comprising a series of prism tiles each having a receiving surface substantially parallel with the pavement surface and a downwardly projecting prism which is provided with two surfaces transverse to the direction in which the light is to be thrown, one of such surfaces being curved and the curvature of that surface and the character of the other surface being such that part of the light received on the receiving surface from a given direction is successively so treated by the prism surface as to be converged along a line just below the lower line of the next preceding prism, and the remainder of the light is directed into horizontal lines.     7. A vault light or prism tile as herein described operating as and for the purpose specified.         Dated this 4th day of May 1897.     F. WISE HOWORTH, 46 Lincoln's Inn Fields, London, W.C., Agent for the Applicant Redhill: Printed for Her Majesty's Stationary Office, by Malcomson & Co., Ltd.--1897