ABSTRACT OF MAGNETICAL OBSERVATIONS. 



47 



but not near enough to bo affected by it). The stones on this hill 

 influenced the magnet strongly when brought near. 



11. St Paul Rocks, Atlantic j Lat. 0° 55' 24" n. 

 Ocean, . . . ( Long. 29 30 w. 



On the southern rook to the n.w. of the peak marked 60 feet on 

 the Ross's chart, published in Sir J. Ross's " Voyage in Southern and 

 Antarctic Regions," vol. i., 1847. The rock was principally serpentine, 

 and had no influence on' the magnets. 



12. Bahia, 



fLat. 12° 59' 18" s. 

 (Long. 38 31 w. 



"{ 



Lat. 12° 56' 0" s. 

 Long. 38 30 30 w. 



a. On the green outside the public gardens, about 15 yards from a 

 large tree at the farther end, 30 yards from the rails of the tramway, 

 and 1 5 yards from the telegraph wires. 



b. On the beach s.e. of Fort Mont Serrat. 



13. Tristan d'Acunha, 



Lat. 



Long. 



37° 27' 0"n. 

 12 17 12 w. 



In a depression on Julia point, a grassy slope about 30 feet above 

 the sea. There was not time for more than one observation of De- 

 clination with Eater's compass, and one Inclination. These give 

 evidence of local disturbance when compared with the results obtained 

 on board by swinging and at anchor. 



14. Cape of Good Hope, 



fLat. 33° 56' 3" s. 

 \ Long. 18 28 45 e. 



15. Kergdelen Island, 



At the Observatory, Cape Town. The Inclination was observed in 

 the Inclination house, and the remainder of the observations in the 

 Declination house. 



f Lat. 48° 

 \ Long. 69 



41' 

 3 



Lat. 

 Lom 



49° 8' 

 70 11 



1 2' 

 30 



>{ 



Lat. 

 Lonsr. 



48° 52' 42" s. 

 69 28 12 



E. 



a. The first station was at Christmas harbour, on the site of Ross's 

 Magnetic Observatory in 1840 — still easily recognised from his 

 description. No local attraction ; but the wind, which blew in heav\ 

 gusts, interfered very much with the observations. 



b. In Betsy cove. Here, as at Christmas harbour, great difficulty 

 was experienced from the strong gusts of wind, which overthrew the 

 tent and shook the instruments, A sheltered position was tried, but 

 it was so boggy and yielding under foot, that it was given up. The 

 place finally selected was on hard rock, at the head of the cove. Both 



