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Section of light court especially adapted to the use of Luxfer prisms wall, this "projection" is the horizontal distance from the wall to the lower edge of the canopy. As soon as the "projection" of each canopy is known, it is evident that the depth of the canopy itself can be found. The projections are found in the following way: Measure the distance from the top of each canopy to the top of the light court; square each one of these distances and add them together, or find their sum. The square of each of these distances bears the same proportion to this sum as the projection of the corresponding canopy bears to one-half the width of the light court. The depths of the canopies are then found by dividing the horizontal projection by the sine of the angle which the canopy makes with the wall. The dimensions of the canopies may be slightly changed if any practical difficulties arise as to supporting them, but this rule gives them the proper size in order to utilize to the best advantage the greatest
  Pocket Hand-Book of Electro-Glazed Luxfer Prisms - Page 96