Reverend and dear Sir,

The Writer of the enclos’d Paper concerning the Variation of the Compass, and the important Use which he supposes may be made of that Variation, not being satisfied with the Judgment of some of our principal Mathematicians here, has earnestly desired me to communicate it to some of my learned Friends in Europe. I know no one better acquainted with the Subject than yourself, and as I cannot refuse complying with his Request, I beg you would excuse my giving you this Trouble, and favour me with a Line expressing your Opinion, which Condescension will very much oblige, Sir, Your most obedient and most humble Servant