it is also interesting to see the numerous options of tiles. When looking at the commercial presentation, it is delightful to read the text, as if the devices were magic …. The size varies but it is approximately 10 x 10 cm. Pennycuick, original patent shows a rather small tile with casted linear prism on the exterior face. they were also made by the American 3-Way Prism Company (with whom they later merged), Solar Prism Company, Condie-Neale, Jupiter Prism Company and others.” Prism tile installations can still be seen in many small towns where they were especially popular as transom lights above storefront windows. They were an instant success and the tiles were very widely used. “They were based on Pennycuick’s 1885 patent for window glass with horizontal prisms on the inner surface, and introduced commercially in 1897 by the Luxfer Prism Company. Glassian:” the most familiar type of prism glass are prism tiles, which take the reflection/refraction idea of semi-prism vault lights and applies it to vertical windows. The important point to remember is that James Grey Pennycuick lead the way: filling patents, creating partnerships, several companies, among which the famous Luxfer company in 1897 in Chicago. Fig: James Gray Pennycuick: original Patent: light redirection principle (source: Luxfer + )
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