US Patent: 402,364
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Azimuth-Instrument
Improved instrument for taking azimuths, using a fully reflecting prism
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Patentee:
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| William Thomson (exact or similar names) - Glasgow, Scotland |
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Patent Dates:
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| Applied: |
Nov. 05, 1885 |
| Granted: |
Apr. 30, 1889 |
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Patent Pictures:
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George Langford
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Description: |
| The principal improvements over the inventor's US Patent 210,068 are the positioning of the two lenses that aid the reading of the azimuth and the substitution of the fully reflecting prism instead of a mirror, the latter being prone to deterioration in the marine atmosphere. |
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