Up: Luxfer Prism
1906 Sweet's
5 of 9
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The sidewalk prism projects the light at an
angle below the horizontal, evading the head beam, and throws it into the
Lucidux, which in turn refracts and diffuses it throughout the basement.
In shallow basements, where the increased light is desired for a short
distance only, the Lucidux may be omitted and the desired results
secured from the sidewalk prisms alone.
Blue prints of first floor plans and, if possible,
a section of elevations showing sidewalk lights should accompany requests
for estimate, or estimates can be obtained from local foundries or iron
works on Luxfer Prism Sidewalk Lights, set complete at the building.
Instructions for setting and drawings showing detail of iron work will be
furnished by us.
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STEEL-
CONCRETE
SIDEWALKS. |
The American Luxfer Prism Company are holders
of License to operate under the Ransome Patents of Reinforced Concrete
construction. Details of sidewalk construction are here shown. (Figs.
9, 10 and 11.)
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| PRISM LIGHTS. |
The steel-concrete light slab is formed
entirely of concrete and glass. The concrete is one and three-quarters
to two inches thick, reinforced by longitudinal and transverse tension
rods of three-sixteenth-inch square, cold-twisted steel. These rods
are embedded in the concrete, filling the spaces between the prisms,
binding the mass, and forming an indestructible support. The prisms are
two and nine-sixteenths inches square on the surface, and have a
scientifically formed pendant projecting two inches below the under
surface of the concrete. The advantage of the prism over the ordinary
vault light is the distribution of daylight back of the building line
into the basement room. (Fig. 9.)
FIG. 9. SIDEWALK PRISMS, SECTIONAL VIEW
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| VAULT LIGHTS. |
This method of construction is the same for
these lights as for the prisms. The lights are two and three-quarters
inches in diameter, having a concave under-surface, and so designed as
to admit the maximum amount of light to the space below. (Fig. 10.)
FIG. 10. SIDEWALK VAULT LIGHTS, SECTIONAL VIEW
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| SUPPORT. |
These slabs of glass and concrete are
supported upon retaining wall and beam at building, and have stiffeners
of steel I-beams or concrete trusses placed at proper intervals. (Fig. 11.)
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