Journal of a Voyage to the East Indies, in the Ship Grenville, Captain Burnet Abercrombie, in the Year 1775By Alexander Dalrymple, EsqFRSCommunicated by the Honourable Henry Cavendish, FRS. . The mean dip corrected is what is fuppofed to be the true dip, .correction is as follows. By the obfervations on July 1 ath, whea the poles were changmarked end of the needle was too heavy, fb as to make that end;too low at that place; and therefore, if we fuppofe that the force piftrong in all parts of the earth, the error produced thereby in otl4|ths of a degree as the cofine of the dip to the radius. T
Journal of a Voyage to the East Indies, in the Ship Grenville, Captain Burnet Abercrombie, in the Year 1775By Alexander Dalrymple, EsqFRSCommunicated by the Honourable Henry Cavendish, FRS. . The mean dip corrected is what is fuppofed to be the true dip, .correction is as follows. By the obfervations on July 1 ath, whea the poles were changmarked end of the needle was too heavy, fb as to make that end;too low at that place; and therefore, if we fuppofe that the force piftrong in all parts of the earth, the error produced thereby in otl4|ths of a degree as the cofine of the dip to the radius. The obfervthe poles were changed at Suez, agree well enough with this fuppoall the obfervations the marked end of the needle pointed to the ^all that part of the voyage fubfequent to July 12th is coiredted by li r 63 and 52of a degree from the mean dip,) 52when the mean dip is between ) 43 (30 But as before the needle left London, changing the poles was foidiflference in the dip, the corre<5tion in the preceding part of the v<gresx, videlicet; of a degree is fubtra£led from the mean/^^ dip, when that dip is between ^^ ats 1 88 2 8. North, and a<the dip i 8 J 18 ±8 1 8 818philtrans02278145
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Keywords: ., bookcentury1700, bookdecade1770, booksubjectproceed, bookyear1778
