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Philosophical Transactions of the Royal Society of London
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III. A letter of Dr Wallis to Captain Edmund Halley; concerning the captains map of magnetick variations; and some other things relating to the magnet

    Sir, I Sent you a Letter about three weeks since, (which, I hope you received,) with my hearty Thanks for the Present you had then sent me; your Map of the Magnetick Variations.

    Footnotes

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