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Single 3-Way Simplex Slab, Completed     The smooth finished underside, with no exposed metal to care for, makes it itself a very attractive ceiling for any basement room. And on account of double concrete mass the vibration is eliminated and the noise of pedestrians' footsteps is not transmitted to the room below, as in other construction.     All glass in the Simplex is the tough , which is provided, the same as in our other constructions, with the Plastic Malleable Coating, so that breakage by the expansion and contraction of the concrete is practically eliminated. And with the edges of the tiles beveled the cement top is worked up over the Plastic coating. It is therefor impossible for the expansion pressure to squeeze any of this coating out, leaving a leaky joint or any unprotected edge of the glass.     All Simplex construction is formed and moulded at the factory, ready for finishing on the job. Thus the number of tiles to the square foot is established and fixed and it cannot be altered. In our specifications are followed in ordering Simplex Construction the architect and the owner can rest assured that they are getting the all the daylight that they specify.     Because of the type of construction, the fixed amount of glass area and the fewness of supporting beams, there probably is no reinforced concrete construction that gives as much light when installed as the Simplex.     The form of the glass tiles is the SIMPLEX is the same as for the Paschall, except that the sides are moulded with a special ridge to make a close joint with the cement. With a maximum of glass area, the SIMPLEX, preformed, leads all concrete types of construction as an effective daylighting installation.     Added to the fact that SIMPLEX is the most efficient as well as the easiest and simplest to install, is the fact that it is the most economical lighting system offered today. Strength, simplicity, effectiveness, safety, freedom from trouble and neatness all combine to make SIMPLEX the ideal installation for sidewalk lights. Showing Effect of Sidewalk Lights on Subway Underneath Platforms at Train Shed in New Michigan Central Depot, Detroit, Michigan.