Up: Paper
Handbook: 11 of 287
|
|
| |
LUXFER PRISMS EXPLAINED.
The natural light of a room comes directly
from the sky, strikes the floor within ten or twenty feet of the window,
and is almost entirely lost upon the floor. The quantity of light
utilized for illuminating a room is very small in comparison with that
which enters the window. When light passes from air to glass it undergoes
a change of direction. This is refraction. It is this property of light
that has been utilized in the Luxfer method of lighting buildings. Luxfer
Prisms are of glass, having one side formed into prisms. These have been
put into a practical form by the process of electro-glazing. By means of
electricity the edges of the prism lenses are so welded together by a
narrow line of copper that the finished product is not only attractive in
appearance, but has also the desired stiffness for use in large frames.
In this new system the light is received upon the outer face of this
composite plate, and by means of the prisms is throw back into the room,
falling directly upon the objects to be lighted instead of being wasted
on the floor. No light is lost, no light is created, but through the
Luxfer Prisms daylight is diffused throughout the interior space; a simple,
certain method of giving to interiors the great desideratum of natural
light at a cost so small that at least 100 per cent annual dividends are
paid upon the investment in resultant economy. Luxfer Prisms do not create
light, but if placed where reached by a fair volume of light from the sky,
will transfer the light where needed. Basements can be lighted to any
desired degree by the use of Luxfer Pavement Prisms set in iron frames
placed in the sidewalk, with vertical frames (technically called lucidux
frames) of prism plates of the required prescription hung below and
opposite. The combination of the pavement prisms and the prism plates
is essential where a basement is to be lighted, the one being a
necessary complement to the other. A very limited amount of the combined
product will introduce more daylight into a basement than an unlimited
quantity of any other form of sidewalk lights.
|
|
|
 |
