The Naval Chronicle Containing a General And Biographical History of the Royal
The Naval Chronicle Containing a General And Biographical History of the Royal
Gray, Thomas 1716-1771
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So, according to the denomination in vulgar use, if un- derstood literally, it names the variation of the true north from the mag- netic north, and not the angle of aberration of the magnetic meridian from the true meridian, which is intended. '' I have not the Directions by me, but conclude that the extract is core rectly made j and, after premising, that a difference of opinion is not inconsistent with that respect which I do certainly entertain for Mr. Hors- burgh, as a zealous searcher and ...promulgator of what he believes to be true and useful, I have to observe, that the above passage appears to me to contain an error; not in any particular part, but throughout ; and, conse- quently, I believe, that the denominations of the variation in vulgar use are correct : that is, when the magnetic north points to the eastward of the true north, the variation of the compass is said to be, not westerly, as above, but eastward ; and that this is right. In allowing the variation upon magnetic courses or bearings, it is ad- mitted that no error exists in the common practice ; and the question, therefore, turns wholly upon the correctness of the denomination.
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