Meaning of heliograph
Pronunciation: (hē'lē-u-graf", -gräf"), [key]
- a device for signaling by means of a movable mirror that reflects beams of light, esp. sunlight, to a distance.
- an instrument for recording the duration and intensity of sunshine.
- an early type of photoengraving made on a metal plate coated with sensitized asphalt.
- to communicate by heliograph.
- heliograph (Thesaurus)