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AMERICAN LUXFER PRISM COMPANY Luxfer Prisms for Lighting Buildings with Daylight HEAD OFFICE 29 EAST MADISON STREET CHICAGO, ILL. CHICAGO, ILL. BRANCH OFFICES FACTORY 37TH AND MORGAN STREETS CHICAGO, ILL. CHICAGO, Heyworth Building BOSTON, 49 Federal Street CLEVELAND, 419-420 Citizens' Building DALLAS, Builders Exchange DETROIT, Builders Exchange DULUTH, 310 West Michigan Street KANSAS CITY, 909 New York Life Building LOS ANGELES, 1835 South Main Street MILWAUKEE, 1717 Wright Building NEW ORLEANS, 904 Hennen Building NEW YORK, 507 West Broadway PHILADELPHIA, 411 Walnut Street ROCHESTER, 38 Exchange Street ST. PAUL, 365 University Avenue SAN FRANCISCO, 1202 Hearst Bldg. Products.     Sole manufacturers of all original Luxfer Prism Glass Products used in the daylighting of buildings in accordance with the Luxfer System.     These comprise Luxfer Prism Transoms and Windows, Luxfer Prism Canopies and Extension Skylights, Luxfer Prism Floor-, Ceiling-, and Roof-Lights, Luxfer Vault Lights, Luxfer Prism Reinforced Concrete Sidewalks, Luxfer Ready-To-Set Sidewalk Light Slabs and Luxfer "Crystolux" Anti-Slip Sidewalk Finish. Co-operative service.     The extensive research work and experiments carried on by this Company have proven the absolute necessity of the application of scientific principles to the daylighting of large interiors. Each contract, therefore, undertaken by this Company, is executed under expert supervision, and Engineers and Contractors are invited to submit their lighting problems to this Company's engineers, for reports on the possibilities and costs of proper and most effective solutions. This service is rendered without charge and does not obligate the inquirer in any way. The Luxfer System.     The principle upon which the Luxfer System is based is derived from the natural laws of refraction. In the application of this principle Luxfer prism glass, in sheet, square unit, or tile form, is used; this being a clear, brilliant product, smooth on one side and with accurate angles on the other, and so designed that over a hundred different angles of refraction comprise the system. By the proper selection and combination of these units with the various angles, daylight is received and transmitted by the refracting ribs into the innermost and darkest corners of any interior.     Each installation is made after the sky conditions have been investigated, and the correct angle of prism prescribed. Where there are a number of floors, each requiring the same intensity and direction of light, the prism angles are, of course, carried to meet the conditions of each floor (see Fig. 2). Fig. 1. TWO EXAMPLES OF LUXFER PRISM GLASS     Luxfer prisms are made of the finest quality pressed crystal glass by a special process. They will not turn purple and give a false light value to objects; they are absolutely clear and will remain so indefinitely. In most exacting engineering department, the construction of the system can be relied upon as being the most practical and durable of any known. Adaptability.     Lighting from the front is usually accomplished by Luxfer vertical prisms. For the rear and sides vertical prisms are used where possible, but in many cases Luxfer skylights and canopies are called into requisition. Again, Luxfer roof-lights and floor-lights have solved many difficult problems, and are frequently used instead of light wells. For the subgrade lighting, Luxfer prism sidewalk lights are effective agents for reducing, or entirely eliminating the need for artificial light. Luxfer Prism Transoms.     Luxfer prism transoms are composed of crystal glass prisms, four inches square, glazed in unit panels of convenient size. When desired some or all of the panels can be equipped with ventilators.     Luxfer prism transom panels are set in exactly the same manner as plate glass, and in the same arrangement of sash and frames, the necessity of skilled labor being eliminated entirely. Fig. 2. DIAGRAM SHOWING NECESSITY OF DIFFERENT ANGLED PRISM GLASS ON EACH FLOOR Fig. 3. LUXFER PRISM TRANSOM, WITH PIVOTING VENTILATOR