Ramsden_zenith_sector.jpg
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Summary
| Description | Ramsden's zenith sector, used in the Great Trigonometrical Survey |
| Date | |
| Source | Strahan, C. (1903). " The Survey of India ". Professional papers of the Corps of Royal Engineers 28 : 141-171. |
| Author | C. Strahan |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer . This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office ) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |