To make the underground
basement as bright as the store itself—and with natural
daylight—seems impossible, yet such is the achievement of the
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.