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J. K. Ingalls, Photography (1850)
PHOTOGRAPHYJoshua King Ingalls [American People’s Journal of Science, Literature, and Art, January 1850, p. 42.] THE employment of light as an agent in copying, or drawing, was suggested as early as the commencement of the present century, by Mr. Wedgewood, and Sir Humphrey Davy. If a piece of paper be dipped into a weak solution of nitrate of silver, and carefully dried, while excluded from the light, it retains its original color; but on exposure, gradually becomes dark, and even black. A paper thus prepared, placed behind a transparent painting, when held up to the light, would copy exactly the […]