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exposed to the weather, the iron work should be of the lightest construction, and great care should be exercised in keeping the glass clean on the outside.
    It is usually impossible to so plan apartment buildings and flat buildings that the light shaft or court will be of the form suggested for office buildings and stores, i.e., a square or rectangle, of which the shorter side is only a few tenths of the height. A very large number of such courts have been treated with prisms, but these are of such an irregular shape that it is impossible to give a rule for the size of the canopies similar to the rules given for courts in office buildings. A rough rule, which is easily applied, is the following: The light delivered by the "A" canopy, if there are no unusual obstructions in the way, is roughly proportional to the product of the area of the canopy multiplied by the area of the top of the light shaft, divided by the square of the height of the light shaft above the prism plate, all the dimensions being in feet.

Nc=(court area)×(canopy area) / (court height)²
In finding the area of the top of the court, if the court is very long, it should not be considered in any direction for a distance greater than one-third the height of the light court above the canopy. If the "C" or the "1/C" canopy is used the result is multiplied by 0.6 and 0.8 respectively.

TABLE OF LUXFER PRISM LUCIDUXES EXPLAINED.

    Tables on pages 246-265 show the prescription for the luciduxes to be used in connection with Luxfer Prism pavements. The light which is projected from pavement prisms alone cannot be thrown in a horizontal direction, because the surface of the pavement itself is practically horizontal, and the light from one prism would strike the prism immediately in front of it. This light, therefore, must be thrown in a direction which makes an angle to the horizontal, and under ordinary circumstances would strike the floor of the basement within a few feet of the front. In order to throw this light back into the basement and to give a satisfactory illumination, it is necessary to provide a vertical sheet of prisms, which receives this light and distributes it into the basement in the
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 98