NEW YORK PRISM COMPANY
N. Y. TELEPHONE 2126 SPRING
|473 West Broadway
NEW YORK, N. Y.
|145 La Salle Street
Manufacturers of 4" × 4" PRESSED PRISMS,
11½" × 11½," ¾" thick,
PLAIN and PRISM VAULT
When prisms are set vertical, they will only operate when the
sky angle between them and building opposite exceeds 40 degrees.
Either rolled sheet prism or 4 × 4 pressed prism hard metal
glazed can be used. The 4 × 4 pressed prism is the most
durable and unquestionably the most effective, being pressed in
many angles to suit different conditions.
4"×4" GLAZED PRISMS
Canopy Prisms can be used in alley-ways or courts where the sky
angle is less than 40 degrees. Set in angle iron frames either
revolving or stationary as desired.
ACME PRISM SKYLIGHT AND CROSS SECTION
Prism extension skylights, being the most effective form of
prismatic lighting, should be set approximately on a 30 degree
pitch from horizontal. Either of galvanized iron or copper bars
with steel cores. (See cut.) Cast iron or steel riveted gutters
are the best. When prism skylights are furnished and set by us,
we not only guarantee results, but guarantee against leakage.
For a strong and durable vault light our steel reinforced
concrete construction glazed with our No. 8 prism lens or No. 9
plain lens will meet the requirements. There is no exposed
iron to rust away, but a solid form of concrete 2" thick
with ¼" cold twisted steel reinforcing rods, running
horizontal and transverse at 3¼ centers. Special Feature.
Our No. 8 prism lenses are scientifically determined. The
reflector surface lies entirely below the concrete construction,
so that none of the light can be obstructed. We make these up
in slabs in our shop, not exceeding 25' each, and ship to all
parts of the country. If you specify that the vault light shall
be NEW YORK PRISM
COMPANY No. 8 prism lens or No. 9 plain lens,
2" square with rounded corners, you are getting the best.
ACME VAULT OR FLOOR LIGHTS IN REINFORCED