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    Canopies are used where the opening to be lighted is opposite site and far below the sky-lines of immediate surrounding buildings, as it is then necessary that the receiving surface of the prism plate be upturned to the light of the sky.
    The use of the canopy has an incidental practical value in protecting show windows and dispensing with awnings, and they may be made attractive and useful features over entrances to public buildings or private dwellings. Continuous canopies are sometimes made protecting the sidewalk and throwing an immense volume of light into the first story of an entire building.
    The prisms in a canopy are oftentimes arranged in groups; the side groups, which may be outside the line of the opening, are put in so that the lines of the prisms are diagonal, throwing the light to one side of the room. In some instances in this way alone can some of the best results be obtained, as a larger volume of light than would otherwise be permitted by the size of the opening can be utilized. In some cases it is desirable to provide the canopy with a vertical or sloping side portion, the whole assuming the form of a hood over the opening.
    In connection with the window plates, foriluxes and canopies, very beautiful effects are secured by the use of the Iridian product. The receiving surface thus shows a rich, substantial texture, sparkling both inside and outside with an irradiation of crystal lines and forms. New effects and possibilities are steadily developing in the artistic treatment of this material.



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  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 17