HELIOGRAPHY
\hˌɛlɪˈɒɡɹəfi], \hˌɛlɪˈɒɡɹəfi], \h_ˌɛ_l_ɪ__ˈɒ_ɡ_ɹ_ə_f_i]\
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The system, art, or practice of telegraphing, or signaling, with the heliograph.
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An early photographic process invented by Nicephore 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.
By Oddity Software
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The system, art, or practice of telegraphing, or signaling, with the heliograph.
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An early photographic process invented by Nicephore 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.
By Noah Webster.
Word of the day
Platidiam
- An inorganic water-soluble platinum complex. After undergoing hydrolysis, it reacts DNA produce both intra interstrand crosslinks. These crosslinks appear to impair replication and transcription of DNA. The cytotoxicity cisplatin correlates with cellular arrest in G2 phase cell cycle.