| http://www.w3.org/ns/prov#value | - FIGURE 3 is a graph representing an average transmittance of visible radiation of photochromic glasses as a function of the hour of day; FIGURE 4 is a sectional illustration of the preferred embodiment of this invention; FIGURE 5 is a graph setting forth the percent transmittance of two different glass panes at various wave lengths of radiation; FIGURE 6 represents a sectional illustration of yet
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