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rich and susceptible to as beautiful treatment as ornamental carvings on the stone or the ornamental work on the terra cotta of the elevation. At the same time, by this treatment the light-giving capacity of the opening is increased from five to twenty-five times, according to its position in the building. By reason of the raised surfaces of this product and the reflecting action of the receiving surfaces, or their prismatic quality, these window plates appear to a greater or less degree to take on color from the surrounding material, or, at least, to be so affected by it as to produce a distinct coloring and tone as distinguished from the ordinary window glass. In this way incidental effects, beautiful in themselves, are invariable produced by local color conditions. When Luxfer Prisms are mounted as canopies or foriluxes, another incidental and brilliant effect is produced by the reflection of the prisms in the plate glass of the window underneath. When viewed from within these prisms are as plainly a new building material as when viewed from without. By the Iridian treatment a fine textile-like effect is produced, so that the appearance of the product is that of a highly interwoven crystal fabric, as delicate and brilliant as the most exquisite of cut glass ware. Wholly new possibilities in modern building are made distinctly probably by means of an intelligent use of this new and susceptible building material. The Iridian product, and the perfected scientific handling of its light-giving qualities have rendered it highly susceptible from an architectural standpoint. Luxfer Prisms are a new and distinct lighting medium, and as such are applied to existing buildings, in appropriate fixtures designed to do the work to the best advantage, and at the same time to add an interesting element to the building from the standpoint of design; not gas fixtures, nor electric light fixtures, but daylight fixtures, quite as legitimate and far more desirable.
    We suggest that prism plates should be used in all stories of a building for various reasons: First, because they are stronger than glass and far less liable to injury; second, because even in the stories where increased light is not so essential, they give enough additional light to make their use an economy, and deep offices, with well lighted ante-rooms, are made possible by this means; third, because they can be made
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 6