the device, art, or rehearse of telegraphing, or signaling, with the heliograph.
an early on photographic process conceived by Nicéphore Niepce, and still found in photo-engraving. It is made up essentially in exposing under a design or in a camera a polished material plate covered with a preparation of asphalt, and subsequently managing the dish with an appropriate solvent. The light renders insoluble those parts of the film which is attacks, and thus a permanent picture is made, that could be etched upon the dish through acid.
a technique of signaling between distant things in the form of the heliograph.
overall, photography; specifically, some special photographic process; photographic engraving. Begin to see the herb, and heliographic engraving, under heliographic.
The description and mapping associated with area for the sunlight.