80 



RECORD AND RESULTS OF 



Comparativt. 



Table of Diurnal Yariatiou of the Magnetic Declination observed at some stations 1 



situated to the uorthward, southward, east^ 



'ard and westward of the Magnetic Pole. 1 



West deflection from the normal position is indicated by a + sign, east deflection by a — sign. | 





West elongations are indicated by a X 



affixed, east elongations by the sign t. 1 





Port Foulke. 



Van Rensselaer Harbor. 



Point Barrow. 



Toronto. 



Philadelphia. | 





December 



January 



Same, 



Omitting 



Omitting 



Winter 



Same, 



Mean local 



to March, 



to March, 



omitting 



larger 



larger dis- 



months, 



omitting 



time. 



1S60-61. 



1854. 



large dis- 

 turbances. 



disturbances, 

 1852-54. 



turbances. 



1841-45. 



large dis- 

 turbances. 



Midnight 



-WX 



—28' 



— 35'I 



+ 5'. 3 



— 0'.6 



— 0'.6 



— 0'.4 



1 A. M. 



—1(5 



—28 



—27 



+ 2.8 



—0.5 



—0.3 



—0.3 



2 " 



— U 



_29t 



— 35| 



— 0.6 



—0.5 



—0.3 



—0.3 



3 " 



— 10| 



—28 



—34 



— 4.4 



—0.7 



—0.4 



—0.4 



4 " 



—12 



-28 



—26 



— 9.0 



—1.1 



—0.5 



—0.5 



5 " 



—11 



—23 



—20 



—11.4 



—1.9 



—0.6 



—0.7 



6 " 



— 6 



—10 



— 8 



—14.6 



—3.0 



—0.9 



—1.1 



T " 



— 2 



+ 1 



+ 9 



— 15.2| 



—4.0 



—1.5 



—1.7 



S " 



+ 7 



+ 12 



+ 19 



—12.7 



_4.4t 



— 2.0J 



2_2t 



9 " 



+ 14 



+ 17 



+ 23 



— S.2 



—3.6 



—2.0 



2.2 



10 "■ 



+ 18 



+31 



+ 30 



— 3.8 



—1.2 



—1.0 



—1.1 



11 " 



+ 15 



+ 30 



+ 29 



+ 1.4 



+ 1.7 



+ 0.7 



+ 0.6 



Noon 



+ 19 



+ 38x 



+ 29 



+ 4.8 



+ 4.0 



+ 2.3 



+ 2.2 



1 r. M 



+ 23X 



+ 35 



+ 34X 



+ 8.2X 



+ 5.1X 



+ 3.2X 



+ 3.1X 



2 " 



+ 22 



+ 26 



+ 26 



+ 7.5 



+ 4.9 



+ 3.2 



+ 3.1 



3 " 



+ 17 



+ 21 



+ 14 



+ 7.2 



+ 3.8 



+ 2.5 



+ 2.4 



i " 



+ 12 



+ 7 



+ 7 



+ 7.2 



+ 2.5 



+ 1.6 



+ 1.5 



5 " 



+ 7 



+ 24 



+ 24 



+ 7.0 



+ 1.3 



+ 0.8 



+ 0.8 



6 " 



+ 2 



+ 12 



+ 6 



+ 6.7 



+ 0.5 



+ 0.4 



+ 0.4 



"t " 



— 5 



— 3 



— 4 



+ 4.4 



—0.1 



—0.3 



—0.1 



S " 



— 9 



— 13 



— 9 



+ 3.8 



—0.2 



—1.0 



—0.5 



9 " 



—13 



—21 



—16 



+ 3.9 



—0.5 



—1.4 



—0.9 



10 " 



—15 



—21 



—13 



+ 4.4 



—0.7 



—1.4 



—0.9 



11 " 



—14 



22 



—22 



+ 5.2 



—0.7 



—1.0 



—0.7 





Northward and Eastward. 



Westward. Southward of magnetic pole. 



The geograpliical position and declination of these stations are as follows : — 



Port Foulke . . 



t = 7S° 



IS' 



>.= 73° 



00' 



D = lll° 



40' W. 



1861.5 





Tan Rensselaer . 



7S 



37 



70 



53 



108 



12 W. 



1854.5 





Point Barrow . . 



71 



21 



156 



15 



41 



E. 



1852-53-54 





Toronto .... 



43 



40 



79 



22 



1 



45 W. 



1853.5 



Third Tol. of Toronto 

 Obs. Lond., 1857. 



Philadelphia . . 



39 



58 



75 



10 



3 



32 W. 



1841-1845 



Part XII of Discus- 

 sion of Gir. Col. Mag. 

 (Mav, 1864). 



Magnetic pole ac-"[ 

 cordina: to Ross ) 



70 



05 



96 



46 







observed | Phil. Trans., 1834, 

 1831 j j A*ol. I, Art. III. 







Magnetic pole ac-"(^ 

 cording to Evans j 



70 



00 



97 



00 







constructed) \j f. . . .,. 





1858 \ 



^ ° 1 



Comparina: the Port Fonlke and 'S'an Rensselaer Harbor diurnal progression, we 

 notice a close correspondence, viz : a maximum ^l•est deflection about 1 P. M. ; a 

 maximum east deflection between 2 and 3 A. M. ; a normal position of the needle 

 about iH P. M. and 7 A, M. ; in fact the only noticeable difference is a less range 



