heliography

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The scientific study of the sun
The system of signalling by heliograph
The art of making a heliograph
The description of the sun
An early photographic process invented by Nicéphore Niepce, and still used in photo-engraving
The system, art, or practice of telegraphing, or signaling, with the heliograph
Photography
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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