Heliography

1 definition found

From 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]