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Roof artificial horizon
A rectangular black-lacquered steel trough with four levelling screws and a black-lacquered brass-framed roof-shaped cover. Two sides of the cover have clear glass panels, at an angle of 90 degrees. Accompanying the instrument is a full, circular wooden jar for storing the mercury when the instrument is not in use. The threaded stopper for the jar is missing. There is also a spirit level, however, a second level is missing.
The artificial horizon is contained in a fitted carrying box, marked on the lid ‘HO [broad arrow] 21’ and containing a trade label for Cary and Co (Henry Porter), 7 Pall Mall London.
The broad arrow and initials ‘HO’ indicate that the instrument belonged to Hydrographic Office of the Royal Navy.
The artificial horizon is contained in a fitted carrying box, marked on the lid ‘HO [broad arrow] 21’ and containing a trade label for Cary and Co (Henry Porter), 7 Pall Mall London.
The broad arrow and initials ‘HO’ indicate that the instrument belonged to Hydrographic Office of the Royal Navy.
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Object Details
| ID: | ZBA0751 |
|---|---|
| Collection: | Astronomical and navigational instruments |
| Type: | Artificial Mercurial Horizon |
| Display location: | Not on display |
| Creator: | Cox, William Charles |
| Date made: | circa 1850 |
| Credit: | National Maritime Museum, Greenwich, London |
| Measurements: | Weight: 3.2 kg |
| Parts: |
Roof artificial horizon
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