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The late celebrated Mr. George Graham made a great number of observations on the diurnal variation of the magnetic needle, in the years 1722 and 1723 ; but declared himself ignorant of the cause of that variation, in No 383 of the Philosophical Transactions, where many of those observations are to be found.

philosophical transactions of the royal society of london

XXXVIII. An attempt to account for the regular diurnal variation of the horizontal magnetic needle; and also for its irregular variation at the time of an Aurora Borealis