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The Collaborative International Dictionary of English v.0.48 (gcide)

Heliography \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 Nic['e]phore
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]

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