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TABLE OF LUXFER PRISM PAVEMENT AREAS EXPLAINED.

    The tables on pages 236-245 show the areas of Luxfer multi-prism pavements necessary for different basements. Each half page contains all the variations of basements of one width. Two classes of illumination have been considered, one is "For General Merchandise," the other "For Storage." The "beam" referred to is the Section through basement showing vault lights construction head-beam (b) at the inner edge of the pavement and supporting the same. It is ordinarily from 4 to 20 inches in depth. The table provides for four different depths--0, 6, 10 and 14 inches. In order to find the square feet of multi-prism plates needed for a basement, select the table containing the given width of basement, select the class of illumination desired, under this select the column corresponding to the depth of beam, and the row across this table corresponding to the length of the basement; the square feet of product is found at the intersection of this row and column. The illumination obtained is independent of the zenith-tangent, provided the zenith-tangent is larger than 0.8; if the zenith-tangent is less than 0.8, the area of the prism plates should be multiplied by the quotient of 0.8 divided by the zenith-tangent, i.e. 0.8/zt. It is assumed that the basement is of reasonable height, say at least 7 feet in the clear, and that its walls and ceiling are light, and that it is plastered, or, at least, that the joists do not show.
    Example 10.--A basement 80 feet long, 30 feet wide, is to be given a fair basement light from one end, the street being 60 feet wide, opposite building 50 feet high, depth of head beam below the surface of the prism pavement is 10 inches,
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 93