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Page 25


Luxfer Lucidux
To make the underground basement as bright as the store itself—and with natural daylight—seems impossible, yet such is the achievement of the Luxfer system.
A Lucidux, or curtain, hung below the head beam, and made of window Prisms of various carefully calculated angles, intercepts the light from the pavement Prisms, refracting it horizontally into the cellar.
The combination is an effectual gloom dispeller—a basement 100 feet deep being well illuminated with pure, healthful, white light from wall to wall. The Lucidux frame may be of wood or iron, and fitted either as a fixture or on hinges.
See illustration.
Data Required when Ordering Sidewalk Prisms
(f) "Sight measurement" of opening.
(g) Size or depth of bearings.
(h) Full size that frames are desired (inclusive of bearings).
(i) Where I beams are used give width of flange on top of beam.
(j) Send sketch with above information marked plainly.
(k) Size of Lucidux panels—give width and height.