. A directory for the North Atlantic Ocean, comprising instructions general and particular for its navigation. Pilot guides. GEOGRAPHICAL POSITIONS. i*v Sir Thomas Brisbane, on his voyage to New South Wales (1821), obtained his time ai the house of Mr. J. W. Gordon, at Funchal, by four excellent chronometers, by which the mean longitude was concluded as 16° 54' 36". At the same time the latitude of the tower, on Mr. Gordon's house, was found to be 32° 38' 19-7", and that of Loo Rock 52° 37' 53-8". The longitude given by Sir Thomas Brisbane was confirmed by ten Admiralty chronome
. A directory for the North Atlantic Ocean, comprising instructions general and particular for its navigation. Pilot guides. GEOGRAPHICAL POSITIONS. i*v Sir Thomas Brisbane, on his voyage to New South Wales (1821), obtained his time ai the house of Mr. J. W. Gordon, at Funchal, by four excellent chronometers, by which the mean longitude was concluded as 16° 54' 36". At the same time the latitude of the tower, on Mr. Gordon's house, was found to be 32° 38' 19-7", and that of Loo Rock 52° 37' 53-8". The longitude given by Sir Thomas Brisbane was confirmed by ten Admiralty chronometers, under the care of Dr. Tiarks, in 1823, which gave for the longitude of the British Consul's Garden, 16° 54' 45" (in time, I'' 7" 39^); the latitude is 32° 38' 22" N. Captain Fitzwilliam Owen, from observations in Leren, 1820, gave the landing-place, near the Loo Castle, ua lat. 32° 37' 42" N., long. 16° 55' 30" W. By telegraphic determinations from Lisbon, made in 1878 and 1879 by United States •ofl&cers, in connection with establishing secondary meridians for the East Coast of South America, the longitude of the flagstaff of Fort St. Jago was ascertained to be 16° 53' 53-4" W.: the latitude is given as 32° 38' 4-08" W. This would place the British Consul's House in longitude 16° 54' 30" W., very nearly the position ascertained bv Dr. Tiarks. 2. Tenerife.—The position of Santa Cruz in the Table is that given by Captain Vidal on his completion of the survey of these islands (1844), and is apparently correct. Pre- vious observations placed the longitude generally one or two minutes more to the west- ward of those in the Table. Captain Fitzwilliam Owen, from his observations in the Leven, 1820, made the Mole Head in lat. 28° 27' 54" N., long. 16° 15' 0" W. The peak in lat. 28° 16' 24" N., long. 16° 39' W. The Variation of the Compass is decreasing at Madeira and the Canary Islands, at the rat
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