Heliograph
Updated short description to match first paragraph text and existing content: article subject is tripod-mounted devices. Added new article, "Signalling mirror" for the handheld daylight signalling mirrors often called "heliograph" in British English.Updated disambiguation page to add that sense of "heliograph".
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{{short description| |
{{short description| Tripod-mounted mirror device used as solar telegraph}} |
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{{about|the signalling device}} |
{{about|the signalling device}} |
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{{Use dmy dates|date=October 2024}} |
{{Use dmy dates|date=October 2024}} |
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