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Previous to our leaving England in 1824, Mr. Christie stated to me that he had some time ago discovered singular magnetic properties to be imparted to iron by simply making it revolve about an axis, and that these properties were exhibited in the different deviations which a plate of that metal would cause in a horizontal needle, according as it was made to revolve gently by the hand in one direction or the opposite: wishing me also to pursue these experiments as opportunities, offered, in the high magnetic latitudes we were likely' to visit in H. M. S. Hecla.

philosophical transactions of the royal society of london

VIII. Account of the repetition of Mr. Christie's experiments on the magnetic properties imported to an iron plate by rotation, at Port Bowen, in May and June,1825. By Lieutenant Henry Foster, R. N. F. R. S.; together with Mr. Christie's remarks thereon.