| Description | Magnetic dip records kept by Edward Sabine. The cover is inscribed: 'Captain Sabine's observations on the Dip and Variation of the needle, and on the Intensity of the Magnetic Force.'
The volume contains an abstract of observations made to determine the variation of the magnetic needle, June-September 1818 and an abstrct of azimuths and amplitudes observed aboard the Isabella, May-October 1818. With two charts plotting dips and variations, inscribed in pencil: 'Not to be presented'.
Observations compiled during the Arctic North-West Passage expedition led by Sir John Ross (1777-1856) aboard HMS 'Isabella' and accompanied by HMS 'Alexander' under Lieutenant William Edward Parry. The expedition reached Lancaster Sound at the north end of Baffin Island and entered Lancaster Sound. |