THE FUTURE OF PHOTOGRAPHY : AN EARLY PROPHECY BY ARAGO. Fig. ISENSITIZING THE DAGUERREOTYPE PLATE. MERCURY FUMES. compared to the succession of discoveries of which unforeseen that one must especially count.' As for portrait photography this is what Arago said that one will ever be able to use the same instrument to make portraits. The problem contains in fact two problems apparently irreconcilable. In order that the image may be obtained quickly that is within the four or five minutes that the person posing must re main immovable it is necessary that this person sit in bright sunlight. But such a bright light causes the most impassive person to wink and squint involun tarily.' And he then tells how Daguerre in some meas ure got around this difficulty by interposing a blue screen. The scientific side of the question naturally appealed to Arago. He mentions immediately the possibility of making photographs of the moon of studying the Hydraulic Plant at Vizzola Italy. A Moth's Knife. good one it is concealed among the dense scales., scientific american, 1902-04-11
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