272 



CARNEGIE INSTITUTION OF WASHINGTON. 



The annual changes for the decHnation (D) and incHnation (7) are invariably 

 referred to the north-seeking end of the magnetic needle. Thus 6' W means 

 that the north-seeking end of the compass moved to the west at the annual 

 average rate of 6' during the period shown in the third column of the tables; 

 1' N means that the north-seeking end of the dip needle moved downwards at 

 the average annual rate of 1' during the period in the third column. The 

 annual changes for the horizontal intensity (H) are given in units of the fourth 

 decimal c. g. s. 



Table 5. — Average anntial changes for the Pacific Ocean. 



Lat. 



Long. 



east 



of Or. 



Approx. dates 



showing 

 time-intervals. 



Average annual 

 change. 



H. 



No. of values used to obtain 

 annual change. 



D. 



I. and H. 



Least No. in 

 any group. 



D. I.andH. 



46. ON 



45. 9N 



45. 4N 



42. 8N 



42. ON 



41. 2N 



39. 2N 



36. 7N 



30. 3N 



27. 2N 



26. 4N 



19. 5N 



17. 6N 



16. 5N 



15. 3N 



15. 3N 



14. 5N 



13. 4N 



11. 9N 



7.6N 



6. ON 



3. ON 



2. ON 



1.8N 



1.4N 



0.4N 



1.5 S 



5.3 S 



11.8 S 



14.6 S 



15.2 S 

 26.5 S 

 28.5 S 

 29.4 S 

 30.1 S 

 31.0 S 

 38.4 S 



39.3 S 

 39.3 S 



159.2 

 162.8 

 164.1 

 221.6 

 190.4 

 222.3 

 231.6 

 150.5 

 144.1 

 199.3 

 131.0 

 218.2 

 144.3 

 243.9 

 174.6 

 174.6 

 236.5 

 239.9 

 244.8 

 164.1 

 234.0 

 246.4 

 161.4 

 244.8 

 244.1 

 246.6 

 178.6 

 176.5 

 216.3 

 246.0 

 246.0 

 268.5 

 223.1 

 242.1 

 222.7 

 187.8 

 221.8 

 220.3 

 220.3 



1906 

 1906 

 1906 

 1906 

 1907 

 1907 

 1906 

 1906 

 1906 

 1905 

 1907 

 1906 

 1906 

 1908 

 1907 

 1912 

 1907 

 1907 

 1908 

 1906 

 1907 

 1908 

 1907 

 1912 

 1912 

 1908 

 1906 

 1907 

 1907 

 1912 

 1912 

 1908 

 1912 

 1912 

 1912 

 1912 

 1912 

 1908 

 1912 



.7-1916.6 

 .7-1916.6 

 .7-1915.6 

 .8-1916.7 

 .0-1915.5 

 .6-1916.7 

 .8-1916.7 

 .7-1916.6 

 .6-1916.6 

 .9-1915.5 

 .4-1912.3 

 .2-1915.4 

 .6-1916.6 

 .3-1916.9 

 .8-1912.3 

 .3-1916.5 

 .5-1915.4 

 .8-1915.4 

 .3-1915.3 

 .5-1915.7 

 .0-1912.6 

 .3-1916.9 

 .2-1915.7 

 .6-1916.9 

 .6-1916.9 

 .3-1912.6 

 .4-1912.4 

 .2-1912.4 

 .1-1912.7 

 .6-1917.0 

 .6-1917.0 

 .1-1913.0 

 .6-1917.0 

 .6-1917.0 

 .6-1917.0 

 .5-1916.4 

 .8-1917.1 

 .1-1917.1 

 .8-1917.1 



6 W 

 6 W 



5 W 

 3 W 



2 E 



1 W 



6 E 

 5 E 



3 W 



3 E 



4 E 



2 W 

 1 W 



7 E 

 



IN 



IS 

 



5 S 

 1 S 

 



2N 

 



'2'S 

 IN 



1 S 



IN 

 2N 



1 S 

 6N 



'4N 

 7 S 

 5N 

 4N 



6 S 



'4N 

 4N 

 6 S 



2 S 

 



3N 



4N 



'2N 

 8N 

 1 S 

 IN 



-2 

 _2 

 

 + 1 

 -2 

 -3 

 -1 



+2 

 -2 

 -1 

 -5 

 

 -7 

 -1 



-2 

 -2 

 -2 

 _2 

 -3 



-^9 



-1-4 

 4-1 

 -3 

 -3 



-7 

 -4 







-4 

 -6 

 -2 



7 and 13 

 3 8 



10 



9 



10 



7 



11 



7 



12 

 16 

 12 

 14 

 12 



3 

 6 

 4 

 6 

 13 



10 

 10 



12 



20 

 33 



13 



23 

 32 



6 and 7 



13 

 6 6 



17 



12 



6 6 



22 



2 

 2 



27 



3 

 2 

 2 

 2 

 6 



3 

 1 



2 

 5 



3 

 20 

 33 



13 



3 



17 



12 



3 



22 



^Three groups only. 



*Two groups only. 



