le of reflecting the identical ray of the pounds) in addition, thus involving a waste ef about spectrum contained in the mercury light, and everything let are also scen to rival it in photographic action. If three-fourths of the power expended. Several plans else, of whatever color it might be by… … light itself, the mercurial light consists of shops, is repeated daily, and the inevit- only ‘six definite homogeneous colors, each able consequence is a blackened ceiling. In some houses the glasses are taken off and arrangement be-employed, and the light be decomposed an having wide black…
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