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In school and office buildings it is only necessary to glaze the upper sash of the window with Luxfer Sheet Prisms to obtain wonderful results.     Samples with estimate of cost furnished on application. SIZES AND HOW TO SPECIFY. FOR STORE FRONTS, OFFICE WINDOWS, CEILING LIGHTS, ETC.     Imperial Polished Prism Plate (maximum size 54" × 60").     American Luxfer Prisms, Electro Glazed (4 inch squares).     American Luxfer Prisms, Interlocked Glazing (4 inch squares).     American Luxfer Prisms, Copper Plated Glazing (4 inch squares). FOR EXTENSION SKYLIGHTS.     American Luxfer Skylight Prism (13" × 13").     Imperial Skylight Prism (18" × 60"). FOR LIGHTING BASEMENTS.     American Luxfer Sidewalk Prism No. 46.--Cast iron frames, cement setting.     American Luxfer Sidewalk Prism No. 60.--Reinforced concrete setting. FOR ALLEY FRONTS, COURTS AND ELEVATOR ENCLUSURES OF OFFICE BUILDINGS.     American Luxfer Sheet Prisms (maximum size 84" × 60"). HOW TO DISTINGUISH THE PRODUCTS OF THE LUXFER SYSTEM FROM INFERIOR IMITATIONS.     All plates made up of four-inch units will have a "Trade Mark" unit glazed in the lower left-hand corner, with the words "Luxfer" and "Patented" in raised letters on the smooth surface. All top lights for store fronts of greater depth than 36 inches will also have an ornamental border of four-inch units, the backs of which are ornamented with raised geometrical designs.     Sidewalk Prisms and 13×13 inch Skylight Prisms have similar "Trade Mark" imprints upon them. TO OBTAIN ESTIMATES.     The American Luxfer Prism Company is ready and willing to make estimates of cost free of charge, and will deem it a pleasure to give information to anyone considering the use of prisms. We have a trained corps of lucical engineers of many years' experience, and their knowledge can be had upon request. FINALLY.     To obtain the best results, and to avoid disputes, always specify American Luxfer Prisms, and insist upon their use. The results will justify the expense. The expense is no more than good material and workmanship demand. We guarantee "The Luxfer System" Prisms to be the best and more efficient for the particular places to which they may be applied. We further guarantee all materials used in connection with our products to be strong and durable in every particular, and all workmanship to be of the very highest order.