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NOTES CONCERNING THE USE OF PRISM PLATES.
VERTICAL PLATES.
    1. Where plates are exposed to the weather, the area of one plate should not exceed fifteen (15) square feet; where sash opening is larger than this, divide it by means of iron sash bars, making two or more plates.
    2. For dimensions, calculate each prism lens an even four (4) inches, allowing one-half (½) inch all around for brass or iron border. When brass border is used add one eighth (1/8) inch more for plates of dimensions less than forty-eight (48) inches (the 1/8-inch allowance is not made where iron border is used); for plates greater than forty-eight (48) inches no extra allowance is to be made.
    3. Sash should be rabbeted with reference to admitting brass or iron border of prism plates, the rabbet being one-half inch deep where possible. See detail sheets of sash.
    4. In special cases, bars one-half (½) inch wide by one-quarter (¼) inch thick, may be glazed into prism plates to receive stiffening bars. See detail sheets of canopies.
    5. Where "Filler Prisms" are required their location should be clearly designated. These fillers are made in the following widths -- ½ inch, ¾ inch, 1 inch, 1¼ inch, 1½ inch, 1¾ inch. By combining these with the prism lenses any with and height of plate can be made. Fillers are made for vertical plates only. See filler diagram.
    No fillers are made for canopy plates.
    6. Iron borders of prism plates are ½×¼ inch.
    7. Where prism plates have curved outlines, iron borders must be used.
    8. The sight opening of sash should clear prisms one-sixteenth (1/16) inch all around. See detail sheets of sash.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 21