XVI. Report of magnetic experiments tried board an iron steam-vessel, by order of the Right Honourable the Lords commissioners of the Admiralty. Accompanied by plans of the vessel, and tables showing the horizontal defection of the magnetic needle at different positions on board, together with the dip and magnetic intensity observed at those positions, and compared with observations made on shore with the same instruments

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Sir,—In pursuance of orders from the Lords Commissioners of the Admiralty, I proceeded to Ireland, taking with me the necessary instruments for ascertaining the deviation of the magnetic needle produced by the local attraction of an iron steamvessel, together with others for determining the dip, magnetic intensity, &c. Every facility for pursuing the inquiry directed by Their Lordships was afforded by Messrs. Laird, of Liverpool, who built the “Garryowen;" and the City of Dublin Steam Packet Company (through Charles W. Williams, Esq.) liberally offered the use of the above-named vessel, on the river Shannon, for the purpose of trying the necessary experiments; and I must not omit to mention in this place my obligation to Professor Barlow, from whom I received many valuable hints relative to the application of his correcting-plate previous to leaving London.

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