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    Lens. A prism lens. A substantially flat piece of glass, one or both faces of which are covered with prisms.
    Light, that which gives us the sensation of sight.
    Lucical. Pertaining to the illumination of rooms-- primarily by means of daylight.
    Lucics. The science which treats of the illumination of rooms-- primary by means of daylight.
    Lucidux. Plural, Luciduxes. A vertical prism plate which receives light from the pavement prisms, and delivers it into the basement in proper directions.
    Luxfer. Light bearing.
    Minor Prism. The prism forming a small portion of the body of a prism plate.
    Major Prism. The prism forming a large portion of the body of a prism plate.
    Multi-prism. A pavement prism, the pendant of which has lenticular back and prismatic sides.
    Pavement Prisms. The prisms set in the pavement or sidewalk, throwing the light upon the lucidux; multi-prisms, etc.
    Polariscope. An instrument which, by the polarization of light, renders evident any strain in a transparent body introduced between polarizer and analyzer.
    Polarized Light. A ray of light whose vibrations all lie in one plane, instead of many, is said to be plane polarized.
    Prism. Ordinarily a piece of glass with two plane faces forming an angle with each other.
    Prism Face. The side of the prism lens containing the prisms.
    Prism Lens. A substantially flat piece of glass, one or both faces of which are covered with prisms.
    Prism Plate. A series of prism lenses glazed into one piece, commonly electro-glazed.
    Prism Prescription is the statement of the prisms needed in a window to accomplish certain results. Prisms are known by letters.
    Projection. The projection of the canopy is the horizontal distance of the bottom of the canopy from the vertical wall when the top of the canopy is in contact with the wall. it is assumed, of course, that the canopy is used in this position.
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