416 



Report of Magnctical Observations at 



(18° + West.) 



Table I. — Hourly Means of Declination at the Falmouth 

 on Five selected quiet Days in 



Hours 



Mid. 



1 



2 3 



4 



5 



6 



7 



8 



9 | 10 



11 



Winter. 



1900. 





i 























Jan. . . 



30 -8 



30-9 



31 -2 



31-4 



31 -5 



31-3 



31 -1 



30-8 



30 -4 



30 -3 



: 30-9 



32-0 



Feb. .. 



30 -3; 30-5 



30 -5 



30-7 



30-8 



30 -5 



30 -1 



29 -8 



29-9 



29-9 



30-4 



31 -2 



March . 



29-61 29-7 



29 6 



29-5 



29 3 



29 -0 



28-9 



28-3 



27 3 



26-8 



27-6 



29-7 



*Oct. .. 



27 -4 



28-0 



28 -2 



27 9 



27-9 



27 '8 



27-9 



27-6 



26 -7 



26 -5 



26 -7 



28-7 



Not. . . 



25 -3; 25 -6 



25 -9 



26 -1 



26-0 



25-8 



25-6 



25 -2 



24 -7 



24-4 



25-5 



26 9 



Dec. .. 



26'8 



27*1 



27 3 



27 '4 



27-4 



27 3 



27-1 



26 -9 



26-6 



26 -6 



26-9 



27 -7 



Means 



28-4 



28 -6 



28 -8 



28 -8 



28-8 



28-6 



28-5 



28 -1 



27 '6 



27'4 



28-0 



29 -4 



Summer. 

















/ 



i 











April . . 



29 *2 



29-2 



29 -0 



29-0 



28-7 



28 -5 



27 -9 



27-0 



26 -1 



25-8 



27-3 



30-1 



May . . 



29-1 



29-2 



29 -2 



28 -8 



28 '4 



27 -5 



26 -4 



25 7 



25 -4 



26-2 



28 -0 



30-0 



June .. 



28-6 



28 -5 



28-4 



28 -4 



28-2 



27 -5 



26 -4 



25 -9 



25-7 



25-9 



27' -6 



30-1 



July .. 



28 '5 



28 7 



28-5 



28 -1 



27-8 



26-7 



25-6 



25-7 



25 -1 



25-2 



26-1 



28-3 



August. 



29 -0 



29 -0 



28-8 



28-8 



28 -3 



27-9 



26 -8 



25 -9 



25 -6 



26 -6 



29 -0 



31 -3 



Sept. .. 



2-8-5 



28 -4 



28-5 



28 -3 



28 -1 



28-0 



27-5 



26 -8 



25-8 



26 -3 



28 -4 



31 3 



Means 



28 -8 



28-8 



28-7 



28-7 



28 -3 



27-7 



26-8 



26-2 



25-6 



26 -0 



27-7 . 



30-2 



t Mean of four days— 2nd, 7th, 13th, 31st. 



Table II. — Diurnal Inequality of the Falmouth 



Mid. 



10 i 11 



Summer mean. 







1 i 

 ' 1 ' 



• I • \ ■ \ < 1 - ! - 









-0-4 



-0-4 -0-5 -0-5 



! ! 



-0-9 -1-5 i-2-4 -3 i-3-6 -3-2 



I 1 1 1 1 



-1-5 



+ 1-0 



Winter mean 





-0-6 



-0-4 



-0-2 



-0-2 



-0 



•2 -0-4 -0-5 



! 1 



-0-9 



-1-4 



-1-6 



-1 -o 



+ 0-4 















Annual mean. 













1 < 



-0-5 



-0-4 



-0-4 



-0-4 



-0 



■6 -l -0 1-1-5 



-2-0 



-2-5 



-2-4 



-1 -3 



+ 0-7 



Note. — When the sign is + the magnet points 



