File:Ramsden zenith sector.jpg
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Summary
| DescriptionRamsden zenith sector.jpg | 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
| Public domainPublic domainfalsefalse |
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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, 1931. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
https://creativecommons.org/publicdomain/mark/1.0/PDMCreative Commons Public Domain Mark 1.0falsefalse
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 18:28, 7 March 2016 |  | 952 × 1,670 (594 KB) | smartcommons>Shyamal | {{Information |Description=Ramsden's zenith sector, used in the Great Trigonometrical Survey |Source={{cite journal|author=Strahan, C. |year=1903 |title=The Survey of India |url=https://archive.org/stream/professionalpape28grea#page/n211/mode/2up |jour... |
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