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Handbook: 96 of 287
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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
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