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J. W. Draper of New York in 1840, resulting in the production of a few "moon-pictures" one inch in diameter; but slight encouragement was derived from them, either to himself or others. It was shown in London at the Great Exhibition of 1851, and determined the direction of De la Rue's efforts. Yet it did little more than prove the art to be a possible one.
Investigations of the kind began to assume a new aspect in 1890, when Professor Holden organised them at the Lick Observatory. Autographic moon-pictures were no longer taken casually, but on system; and Dr. Weinek's elaborate study, and skilful reproductions of them at Prague, gave them universal value.
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