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plate shall not be more than three-sixteenths of an inch measured transversely to the length of the prisms.
Metal Border.
    All plates shall be built in a metal border either of T shape formed with square root angles, or of a rectangular section, in either case having a margin of not less than one-half inch in width and sufficient to allow the same to be properly set.
Strength of Plates.
    All plates shall be guaranteed to be as capable of resisting wind pressure as plate glass of the same size and thickness, and to be proof against both wind and water, without the use of cements or other plastic material.
Finish of Plates.
    NOTE. -- Unless otherwise specified, the plates will be furnished in their natural copper color. This can be changed by the addition of either nickel or silver plating. If such is desired it should be clearly specified.

HOW TO SPECIFY LUXFER PRISM PAVEMENT TILES.

Sidewalk.
    The sidewalk of the building as shown on drawings shall consist of Luxfer Prism Companies' Pavement Prisms, properly mounted and supported in cast iron frames.
Supports.
    All cast or wrought iron beams necessary for the support of the frames shall be furnished of ample section to carry the frames and a further load of ---- pounds per square foot.
Iron Frames.
    The frames shall be in section not exceeding three and one-half (3½) feet in width (measured parallel to face of building), each section free from winds and guaranteed to support a load of ---- pounds per square foot, and all joints close fitting.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 26