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HELIOGRAPHY - Definiția din dicționar

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He`li*og"ra*phy, n. 1. [Helio- + -graphy.] The description of the sun.
[Webster 1913 Suppl.]

2. The system, art, or practice of telegraphing, or signaling, with the heliograph.
[Webster 1913 Suppl.]

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.
[Webster 1913 Suppl.]

4. Photography. [Archaic.] R. Hunt.
[1913 Webster]