Image: Ramsden zenith sector
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Description: Ramsden's zenith sector, used in the Great Trigonometrical Survey
Title: Ramsden zenith sector
Credit: Strahan, C. (1903). "The Survey of India". Professional papers of the Corps of Royal Engineers 28: 141-171.
Author: C. Strahan
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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