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When Luciduxes
Are Required in 
Basement.
Lucidux Plates.
    Place in basement where shown on the drawings, Luxfer Prism Companies' plates of the type and finish
known as Open Brace Cut Prism Plates.
Iridian Prism Plates.
Composite Prism Plates.
Compound Prism Plates.
Commercial Prism Plates.
Factory Prism Plates.
Close Brace set in
frames of { wood / metal }, furnished by another contractor.
When
Cut Prism Plates,
Iridian Prism
    Plates,
Composite Prism
    Plates, or
Compound Prism
    Plates
Are Required.
Quality.

    The plates shell be composed of Luxfer Prism Companies' lenses made of clear crystal, of prescription indicated by letter or letters on the drawing and as per list and diagram attached hereto.
    These lenses shall have the prisms pressed full and extending to within not less than one-sixteenth of an inch across the entire width of each lens.
    The reverse, or plane face, shell be pressed smooth and present a true plane; and shall be thoroughly annealed and shall stand the polariscope test for absence of strain.
    Iridian faced prism lenses shell conform strictly to the pattern of ornamentation selected, and conform in other respects to the requirements stated before.
    The Composite and Compound Prism Plates shall have the lenses arranged to form design pattern as indicated on the drawings.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 24