US Patent: 210,068
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Improvement in Devices for Taking Azimuths
Navigational instrument for use with the mariners' compass
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Patent Dates:
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| Applied: |
Dec. 31, 1877 |
| Granted: |
Nov. 19, 1878 |
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Patent Pictures:
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Description: |
| The instrument is placed onto the center of the mariners' compass, and the integral mirror is then used to sight an object on the horizon while simultaneously reading the heading on the compass card. |
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