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LUXFER PRISM PRODUCT CLASSIFIED.

    The Luxfer Prism Companies manufacture the following described grades and qualities of their product:
WINDOW PRISMS.
    The different classes are technically named and described as follows:
"Composite."
    A prism plate composed of prism lenses some of which are "Cut" and others "Iridian," arranged in various forms and patterns, and called "Composite."
"Cut."
    In this class of our product, each piece, or prism lens, is tested by polariscope to eliminate those lenses that may be strained in the process of manufacture; sized, by being ground on the edges to fit exactly to within one hundredth of an inch in the assembling; ground and polished on the receiving face, the same as plate glass. The pieces or lenses are electro-glazed into their frame, so as to give the greatest possible strength with the least amount of weight and opaque area, and so as to make the plate absolutely wind and water tight. The metal portions may be copper, nickel or silver plated.
"Compound."
    This term is applied to prism plates composed of prism lenses, some of which are "Iridian," and other are "Commercial."
"Iridian."
    This product is the same as the "Cut," with this exception, that the receiving surface of each prism lens is enriched by a series of lines worked in the substance of the prism lens, which inter-act in a peculiar manner with the prisms of the acting surface. This product is called Iridian.
    In all of the above glasses, the prism lenses are tested on the polariscope.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 18