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 H.M.S. 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 

 rate of about 3' per annum. 



11. CAPE VERDE ISLANDS. 



authorities. 



Sal or Salt Island : 



North Point 



South Point 



Lion's Head, summit 



16 51 

 16 34 15 

 16 41 35 



Bonavista : 



Sol or N.W. Point 16 13 10 



Pontinha or N.E. Point! 16 11 45 

 English Road, Lightho.i 



on Small Island ' 16 9 10 



Cm-ral Velho or South. 



Point 15 57 



Leton Rock 



Mayo, or Isle of May : 



North Point 



English Road, Light on 



Fort 



South Point 



15 48 



15 19 



15 7 30 

 15 6 40 



22 55 

 22 56 30 

 22 59 40 



22 56 30 

 22 44 



22 57 15 



22 49 10 



23 9 5 



23 12 5 



23 13 20 

 23 10 15 



I 



20 15 



20 5 



The Survey by Lieutenants 

 (afterwards Captains) Vidal 

 and Mudge, R.N. ,1819— 1821; 

 compared with the obser- 

 vations of Captains Kin g, 

 Foster, Owen, &c., &c. 



