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    Receiving Face. The face of the prism lens that is ordinarily set to the weather.
    Reflection. When light falls upon a body, a part of it is thrown off. This action is called reflection.
    Refraction. When light passes from one medium into another, such as from air to glass, it undergoes a change of direction. This action is called refraction.
    Reveal. Any outward projection over and at the sides of a window measured from the plane of the window.
    Shade-- See window shade.
    Sky. The atmosphere contains dust, water particles, vapor, etc., which form a diffusing screen rendered bright during the day by the light of the sun and constituting the light-giving sky.
    Slope. The angle at which a canopy sets, measured from the vertical.
    Tilted. A prism lens whose prisms do not run parallel to the top or bottom of the lens, but make an angle thereto, is said to have its prisms tilted.
    Vault. The space under a pavement or sidewalk separated from the basement by the lucidux.
    Window Shade is a roll of cloth or paper capable of being conveniently extended over an opening to shut out an abnormal amount of light. See page 100.
    Zenith. The point immediately overhead.
    Zenith Distance. The angle from the zenith to the line of the direction of the lowest light coming over the building opposite.
    Zenith-tangent. The street width divided by the height of the opposite building. Tangent of zenith distance. See page 80.









  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 282