 heliograph |
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| 1. | [ verb ] (telecommunications) signal by means of a mirror and the using the sun's rays | |
| Related terms: | sign | |
| 2. | [ noun ] an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on | |
| Related terms: | apparatus | |
| Similar spelling: |
heliogram heliogravure |
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