HELIOGRAPHY - Definiția din dicționar
Traducere: română
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He`li*og"ra*phy, n. 1. [
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2. The system, art, or practice of telegraphing, or signaling, with the heliograph.
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3. An early photographic process invented by Nicéphore Niepce, and still used in photo-engraving. It consists essentially in exposing under a design or in a camera a polished metal plate coated with a preparation of asphalt, and subsequently treating the plate with a suitable solvent. The light renders insoluble those parts of the film which is strikes, and so a permanent image is formed, which can be etched upon the plate by the use of acid.
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4. Photography. [Archaic.]
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