File:Percy Sladen Trust expedition 1905 magnetic variation transactionsofli214linn 0024.jpg

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Summary

Description
English: Chart of curves of equal magnetic variation in the Indian Ocean, from the Percy Sladen Trust expedition in 1905.
Date
Source https://archive.org/details/transactionsofli214linn/page/10
Author Author of article: Boyle T. Somerville (1863-1936)

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Chart of magnetic variation in the Indian Ocean, 1905

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31 December 1912Gregorian

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