desirable in almost all stores to have the space in the front ten
or fifteen feet of the store lighted in a rather more brilliant manner
than the rest of the store. In order to accomplish this, the light should
be thrown down from the prism plate at an angle below the horizontal from
30° to 40°, depending upon the height from the floor of the prism
plate. It is readily seen, therefore, that if the top of the show window
is flat and stands in a horizontal position, it will cut off practically
all of the light from the prisms coming down in this direction so that the
front space of the store will be the darkest area. In order to obviate
both of the difficulties suggested above, the show window having a vaulted
top is very highly recommended. The bent portion may be made of ornamental
glass and present a very neat appearance on the outside. If for any reason
it is impracticable to use this form, the show window having a flat top
and sloping back from the transom bar at an angle of about 20° below
the horizontal is recommended.
General Arrangements.
It not only becomes advisable to make the
walls of the rooms as light as possible, but also to arrange the furniture
and all the fittings of the room so as to best utilize the light obtained
from the prisms. In general, the objects which require a brilliant light
should be located in the fore part of he room, and the objects requiring
less brilliant illumination in the rear. So far as possible partitions
should be avoided. Where partitions are absolutely necessary they should
be reduced either to railings without any filling, or to glass partitions
filled with clear or chipped glass, the woodwork of which is very light.
Balconies running the length of the room should be avoided if possible,
and the same is true of elevated offices. Desks should be arranged so as
to take the light over the left should of the man occupying same, or as
nearly in this direction as possible. Never arrange a sloping desk so
that the occupant faces the light. In the case of machinery which requires
a vertical light to fall directly upon some specially important part, it
is often convenient to arrange a small highly polished mirror so as to throw
the light from the prism plates upon this part, by setting the mirror at
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