+
-
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.
For more information about using images from our Collection, please contact RMG Images.
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
|