LIEUT.-COLONEL SABINE ON TERRESTRIAL MAGNETISM. 

 Table IX. (Continued.) 



27 



Station. 



Monterey 



S'* Barbara 



San Pedro 



San Diego 



San Quentin . . , . 

 San Bartholomew 



Magdalena Bay < 



San Lucas Bay , . 



Mazatlan . . . . < 



Date. 



r 



San Bias. 



Socorro Island 

 Clarion Island . . 



Martins Island < 



Bow Island. , . . <( 



1839. 

 October 5 . 

 October 10 . 

 October 12 . 

 October 17 . 

 October 24 . 

 October 29 . 

 November 1 

 November 1 

 November 21 

 November 29 

 December 2 

 December 6 

 December 19 

 December 8 

 December 8 

 December 10 

 December 10 

 December 11 

 December 26 

 December 29 



1840. 

 January 23 . . 

 January 25 . . 

 January 27 . . 

 February 6., 

 February 29.. 

 February 25. . 

 February 26. . 

 February 27. . 

 February 22. . 

 March 14.. . . 



March 20 



March 21. . . . 



Poles. 



Direct. 



60 59-6 

 58 53*2 

 68 14-7 

 56 49-5 

 54 01 -9 

 51 12-7 

 45 22-1 

 45 37-5 



44 37-5 



45 42-7 

 45 43-6 

 43 34-5 

 43 40-8 

 43 39-9 

 43 38-4 

 43 42-7 

 43 39-9 

 43 42-7 

 39 31-8 

 35 21-4 



-13 

 -13 

 -13 

 -30 

 -30 

 -30 

 -30 

 -29 

 -30 

 -29 

 ■29 

 ■29 



20-2 



12-3 



22-5 



13-9 



18-0 



07-1 



00 



43-4 



04-8 



44-6 



27-7 



28-7 



Reversed. 



61 07-5 



58 55 

 58 28-1 

 57 22-7 

 54 58 

 09-4 

 40-5 

 36-0 

 41-0 

 30-0 

 47 37-7 

 45 22-8 

 31-7 

 39-4 

 39-4 

 29-9 

 29-9 

 40-6 

 55-5 

 44-6 



52 

 47 



47 

 46 

 47 



45 

 45 

 45 

 45 

 45 

 45 

 41 

 38 



lacUnation. 



46 31 

 46 36 



1} 



-14 

 -14 

 -14 

 -30 

 -30 

 -31 

 -30 

 -30 

 -30 

 .30 

 -31 

 ■31 



53-6 

 50-6 

 56-5 

 19-7 

 24-4 

 08-6 

 38-2 

 08-2 

 13-4 

 37-5 

 IM 

 14-8 



46 

 46 

 44 

 44 

 44 

 44 

 44 

 44 

 44 



36-3 



40-7/ 



28-7' 



36-3 ' 



39-6 



38-9 



36-3 



34-9 



41-6 



14 

 •14 

 14 

 30 

 30 



06-9 

 01-5 

 09-5 

 16-8 1 

 21-2/ 



-30 09-r 



■ 30 IM 



30 19-4 



30 21-7 



61 03-6 

 58 54-1 

 58 21-4 

 57 06-1 

 54 29-9 

 51 41-0 



46 34-0 



45 39-3 



46 38-5 



44 32-5 



44 38-3 



40 43-7 

 37 03-0 



-14 06-0 



-30 19-0 



-30 37-9 



— 30 19-1 



-29 55-8 



-30 15-3 



Remark*. 



Fossil Island. 



Beach. 



Tepic. 



Anna Maria Bay. 



Entrance Village. 



S.E. point. 

 S.W. point. 

 Western extreme. 



Observatory. 



Total Intensity. — The values of the total intensity of Captain Belcher's American 

 stations are deducible from the values of the horizontal intensity in Table VI., and 

 of the inclination in Table IX., by the formula 



1=1. 



h' sec 



h sec i ' 



where i, h, and I are the inclination, horizontal and total intensities at Woolwich, 

 and i', h', and I' the values of the same at any other station. Regarding Woolwich 

 and London as identical, we have I = 1*372, the conventional number by which the 

 total intensity in London is usually expressed. The values of the total intensity in 

 Table X. have been thus computed. 



Declination. — The declinations were observed with a nine-inch altitude and azimuth 

 instrument by Cary, having a four-inch magnetic needle attached, which was read 

 at both extremities. Each determination is stated to be the mean result of several 

 observations, both of the true meridian, and of the magnetic direction. 



b2 



