Artificial bubble horizon
- Made:
- 1905-1910 in City of London
- maker:
- Henry Hughes and Son Limited
Paget type, artificial bubble horizon, designed and made by Henry Hughes and Son, City of London, England, 1905-1910. Mounted behind the horizon glass of a sextant it consists of a curved bubble level in right-angle tube containing a prismatic lens with cross-wires and adjusting screws. In use the observer views the bubble via the prism and aligns the cross-wires, which replaces the horizon. It can only be used during daytime with sufficient light, an improved version, from around 1914, was fitted with electric illumination for night-use.
Details
- Category:
- Astronomy
- Object Number:
- 1911-219
- Materials:
- metal, glass and plaster of paris
- credit:
- British Admiralty (Hydrographic Department)