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LUXFER PRISM GLOSSARY.

    Beam, Head beam. The beam supporting the pavement at the "building line," commonly an I beam placed under the inner edge of the pavement. See page 93.
    Canopies. External prism-plates in separate frames set at an angle to the vertical. Usually this angle is about 50°.
    Day-light. The light of day. This comes principally directly from the sky, and a small amount indirectly from buildings, and substantially all of this comes primarily from the sun.
    Depth. The depth of a prism plate is the distance from its top to its bottom, measured along the vertical edge of the prism plate.
    Diagonal Canopy Lenses. Prism lenses with tilted prisms placed in the sides of a canopy plate throwing the light diagonally through the window.
    Diffusion. When light falls upon some unpolished bodies instead of being thrown off in one general direction, it is thrown off in all directions. This action is called diffusion. Almost all bodies have this property to a greater or less degree. Walls which are not glossy have this property to a very large degree.
    Electro-glazing. The process of glazing pieces of glass into large plates by means of electrolysis. See page 12.
    Forilux. Plural, Foriluxes. A prism plate set in a separate frame, and placed in a window opening, substantially flush with the face of the building. See page 32.
    Head Beam. The beam supporting the pavement at the building line, commonly an I beam placed under the inner edge of the pavement. See page 93.
    Holland Shade. The particular glass of goods used in shades over Luxfer Prism plates.
    Illumination is the quantity of light falling on unit surface. The illumination in a room is good, if objects are easily distinguished therein. Hence intensity of illumination varies as objects are more or less easily distinguished.
    Iridian. Prism lenses having upon the receiving face a design wrought in the material.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 280