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Handbook: 95 of 287
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While fair results may be obtained upon smaller courts, we recommend
for good results that the side of the light court, for offices about
20 feet deep, be three-tenths of the height of the enclosing walls,
and very brilliant results may be obtained in a light court the width
of which is five-tenths the height. The accompanying illustration,
Fig. A, shows the method of treating a square light shaft, the dimensions
of which are three-tenths the height of the enclosing walls. Vertical
prism plates should be used for the openings in the upper half and
canopies in the lower half. It is customary to make the upper one or
two canopies of the C canopy and the lower ones of the A, and possibly
the lowest one of the 1/C. Also it is sometimes desirable
to set out from the wall the lower canopies, in order to get them from
under the shadow cast by those immediately above. The window openings
should be made as large as practicable.
In order to find the relation of the sizes
of these canopies, so that they shall deliver into the rooms on each
floor substantially the same amount of light, we find the horizontal
projection of each one of these from the wall of the court. This
is shown by letter P in sketch below. If the top of the canopy is
set so as to touch the
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