ized, since it has brought is also a scientific process of marvelous power, and to make portraits. The problem contains, in fact, two us only those make-believe photo-chromos against it can be said without exaggeration that it has trans- problems apparently irreconcilable. In order that the which… … ference in thin films plays a certain role [this is the by one of the most brilliant scientific spirits of the Fig. 1.—SENSITIZING THE DAGUERREOTYPE PLATE. principle of the great discovery of M. Lippman]. Per- past century—the great Arago. haps he has accomplished the same with red and violet The…
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