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LUXFER PRISM INSTALLATIONS EXPLAINED.

    In installing Luxfer Prisms, they have been considered as a new light transmitting medium, and have been applied to the better class of existing buildings in fixtures peculiar to themselves and appropriate to the buildings. Each case required some special treatment at the hands of the architect of the building.
    Lucidux.    It has been found impossible to light basements in a satisfactory manner by any device placed in the pavement alone. Successful lighting has been accomplished by combining with the Luxfer Prism pavement lights a vertical prism place technically called the "Lucidux," hung as an apron between the basement and the vault under the sidewalk. The lucidux receives the light from the pavement prisms and projects it into the basement.
    Pavements.    Pavement lights vary greatly among themselves with reference to the volume of light which they are able to transmit. When compared with the results of the common pavement prisms the volume of light transmitted to the lucidux by Luxfer Pavement Prisms is enormously increased by reason of their carefully calculated surfaces and by means of the prisms on the ends of the pendant.
    Window Plates are such prism plates as are substituted in the window sash for the glass ordinarily used. Such prism plates may be used for the entire window or for a single sash or a portion of the sash, or for a transom in store fronts.
    A Forilux is a prism plate of any given size appropriately mounted in an independent frame. This is affixed to the building where required in a vertical position in or opposite the window opening.
    A Forilux usually clears the reveal and is attached to the walls about the opening in a simple manner, flush with the wall faces. The walls are not mutilated beyond the drilling of a few small holes in the jambs or soffit of the opening, the idea being to preserve the individuality of the fixture as something desirable in itself, and at the same time respect the original design of the building.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 15