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Heliograph supplementary mirror
The supplementary mirror is pivoted in a forked frame, and has a spigot which fits into the socket at the end of the sighting arm. At the centre of the mirror, a piece of paper is pasted, which has the same form as the sighting vane.
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Object Details
| ID: | NAV0930.2 |
|---|---|
| Type: | Heliograph supplementary mirror |
| Display location: | Not on display |
| Creator: | Unknown |
| Date made: | Unknown |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Overall: 28 mm x 170 mm x 200 mm |
| Parts: |
Heliograph
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