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The daily variation of the horizontal needle was first observed  in London by Mr. Graham, in the year 1722; but  in consequence of its small amount, it has always been considered  amongst the minor phenomena which the magnetic  needle presents. Mr. Barlow , however, having explained  a method of encreasing the amount of this daily change very  considerably, in any latitude, this phenomenon began to assume  a different character, and seemed to furnish a subject  of highly interesting, if not of useful, enquiry.

philosophical transactions of the royal society of london

III. Magnetical Observations at Port, &amp;c. A. 1824-25, comprehending observations on the diurnal variation and diurnal intensity of the horizontal needle; also on the dip of the magnetic needle at Woolwich, and at different, within the arctic circle.