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New York Prism Company - 1906 Sweet's, Page 277
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  NEW YORK PRISM COMPANY
473 West Broadway
NEW YORK CITY, N. Y.
TELEPHONE 2126 SPRING
FIG 1. PRISMS SET IN SASH OF VERTICAL FRAME
FIG 1.

FIG 2. REVOLVING PRISM CANOPY
FIG 2.

FIG 3. PRISM SKYLIGHT, FIRST FLOOR
FIG 3.

FIG 4. PRISM VAULT LIGHTS, BASEMENT
FIG 4.
Diagrams showing method of
application of Prism lighting
PRODUCTS Manufacturers of ACME 4" by 4" PRESSED PRISMS, ACME SKYLIGHT PRISMS, ACME VAULT LIGHT PRISMS, ACME SHEET PRISM GLASS, ACME VAULT LIGHTS, ACME IRON CANOPY FRAMES.
VALUE OF
NATURAL
LIGHT
    Prism lights have come into such universal use, that their value and light diffusing qualities need not be dwelt upon. Modern buildings, owning to the enormous value that real estate has attained, have a dearth of light that has to be overcome, either by use of artificial light, or the use of Prisms. The latter is of course the cheaper,. as after the initial expense of setting the Prisms, no further disbursement is needed, whereas artificial light is a continual source of expense from month to month. Prisms, supplying as they do natural light, do not tire the eyes as all artificial light does. As long as there is a window from which natural light can be obtained, Glass Prisms of various angles will change the direction of the light, so that it enters freely into dark places.
METHOD
OF USE
    When the glass is to be used in an ordinary window, it must be borne in mind that if the glass is shadowed by a reveal or projection greater than 12 inches, the Prisms must be set in a separate frame, flush with the walls. 4 by 4 inch Prisms, or Sheet Prisms should be used. (See Fig. 1.)

    When Prisms are thus set vertically, they will only operate when the sky between them and the building opposite exceeds 40 degrees; any less degree of sky compels the use of iron canopy frames (See Fig. 2), which in size should be the width between the brick window jambs by two-thirds of the height of the window. Canopies are made stationary or revolving, as desired.

    Prism Extension Skylights (See Fig. 3) are the most effective form of Prism lighting. A skylight must have a pitch of approximately 30 degrees from horizontal; ribs 3½ inches deep; copper or galvanized iron with steel cores; ribs set 12 inches to centers; caps and flashing; gutters must be made of cast-iron, or riveted steel plates; the glazing should be ACME SKYLIGHT PRISM ¾ inch thick.

    Sidewalk Prisms or Vault Lights (See Fig. 4) are composed of cast-iron margin frames, filled with cast-iron tile webbing and glazed with ACME VAULT LIGHT PRISMS set in Portland Cement; or concrete reinforced construction, glazed with PLAIN LENSES for a cheaper grade.
TRADE MARK The word "ACME" is our trade mark and it is on all our products as a guarantee of excellence.
PLANS
SUBMITTED
We will be pleased at any time to aid architects and engineers to overcome any difficulty of Prism Lighting they may come in contact with. We will submit plans and estimates promptly at any time and without charge.
INSTAL-
LATION
    Our goods are shipped carefully packed and can be set by any mechanic of ordinary intelligence. Particular attention is given to export orders and full instructions are sent as a guide to their installation by foreign workmen.