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S (Stack - oversize)Wilde, Henry
On the Causes of the Phenomena of Terrestrial Magnetism, and on some Electro-mechanism for Exhibiting the Secular changes in its Horizontal and Vertical Components
Reprinted from the Proceedings of the Royal Society, 1890/91. NB: The separate map of the world, with lines of no declination given by this Magnetarium for 1700, drawn in by the author in pencil. [Accompanied Wilde's instrument, which he gave to the Clarendon Laboratory, Oxford]. Formerly the property of ?R. B. Clifton (*)
[Unknown]
1891?