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and the height of the surface of the pavement from the floor of the basement is 8 feet.
    Solution.--Turning to page 238 we select the upper half of the page corresponding to "basement 30 feet wide;" we select the "Storage Illumination," and of this table take the third column and the seventh row corresponding to "length of basement 80 feet;" we here find that we need 178 square feet of multi-prism sidewalk. This forms a strip of prisms in front of the building practically six feet wide.
    In order to determine the prescription for the lucidux, turn to page 251 corresponding to the height of the prism pavement above basement floor, 8 feet, and to the first column headed 6 feet, because the width of the multi-prism sidewalk prisms is 6 feet. The prescription for the lucidux, therefore, will be found in the first column marked 6, and should have a depth of 60 inches, as indicated in the first left-hand column, in order to get the best results. Since, however, the lower edge of our beam is 10 inches below the sidewalk prisms we may discard the upper 10 inches, consisting of 3 rows of J's of lenses of the lucidux. Our lucidux will, therefore, consist of 13 rows of prism lenses of the following prescription, J, K, K, L, L, M, M, N, N, O, O, O, from top to bottom. The lucidux will be arranged in several pieces of prism plates appropriately supported, and when complete will run entirely across the basement. Should it be impossible to install a lucidux of the indicated depth, reduce the area always by omitting the bottom rows.


COURTS AND LIGHT SHAFTS IN RELATION TO LUXFER PRISMS.

    If prism plates are used in connection with the windows of light courts in office buildings, the dimensions of these courts may be materially reduced and yet give a much better illumination to the offices. Whatever the dimensions of the court to which Luxfer prisms are applied, the light obtained is very greatly improved. In designing new courts they should, when practicable, be substantially square and not long and narrow.
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 94