The Magnetic Elements at the Cape of Good Hope. 5 



was observed five times daily, viz., at Ih. 34:m. p.m., 5h. 34m. p.m., 

 9h. 34m. p.m., 5h. 34m. a.m., 9h. 34m. a.m., Cape time. 



The monthly means given on page Ih, are the average of all the 

 values obtained during that month. 



The declination results for the period October, 1860, to January, 

 1869, were observed twice daily — Sundays and public holidays 

 excepted — at lOh. 34m. a.m., and 3h. 34m. p.m.. Cape time. 



The results given under the headings lOh. 34m. a.m., and 

 3h. 34m. p.m. are the means of the observations made at these 

 hours for the periods given. The results of these years are of 

 considerable interest, as it was at this time that the magnetic de- 

 clination for a number of years was practically steady. 













Declination. 





Month. 



Mean, 1850. 





Declination, 1851. 



1852. 



Jan. 











29° 19' -3 W. of N. 



29° 22' -2 W. of N. 



Eeb. 











29 20-G 



29 23-4 



March 











29 20-7 



29 23-2 (first ten clays only) 



April 











29 20-7 





May 











29 20-7 





June 











29 20-6 





July 











29 20-9 





Aug. 











29 21-0 



* 



Sept. 



29= 



20-0' 



W 



of N. 



29 22-4 





Oct. 



29 



19-3 





)) 



29 22- 1 





Nov. 



29 



19-1 





11 



29 21-6 





Dec. 



29 



18-8 





1 1 



29 19-9 





Declination Eesults, 1860-1869. 



Date. 



lOh. 34m. 

 a.m. 



3h. 34m. 

 p.m. 



Mean. 



Yearly Mean. 



1860. Oct. 8-Oct. 17 



29° 45 '-7 



29°37'-9 



29° 



41'-8 W. of N. 29°41'-8 W. of N 



Oct. 18-Oct. 27. 



29 46-1 



29 37-1 



29 



41-7 





Oct. 28-Nov. 6. 



29 49-0 



29 38-3 



29 



43-7 





Nov. 7-Nov. 16. 



29 45-4 



29 37-5 



29 



41-5 





Nov. 17-Nov. 26. 



29 45-4 



29 37-0 



29 



41-2 





Nov. 27-Dec. 6. 



29 45-6 



29 37-5 



29 



41-6 





Dec. 7-Dec. 16. 



29 45-2 



29 38-1 



29 



41-7 





Dec. 17-Dec. 26. 



29 44-1 



29 37-6 



29 



40-9 





1861. Dec. 27-Jan. 5. 



29 47-1 



29 37-4 



29 



42-3 



,' 29°44'-8 W. of N 



Jan. 6- Jan. 1-5. 



29 46-9 



29 38-5 



29 



42-7 





Jan. 16- Jan. 25. 



29 46-6 



29 39-1 



29 



42-9 





Jan. 26-Feb. 4. 



29 47-8 



29 41-6 



29 



44-7 





Feb. 5-Feb. 14. 



29 48-8 



29 39-5 



22 



44-2 





Feb. 15-Feb. 24. 



29 48-9 



29 42-1 



29 



45-5 





Feb. 25-Mar. 6. 



29 50-1 



29 40-1 



29 



45-1 





Mar. 7-Mar. 16. 



29 52-8 



29 40-9 



29 



46-9 





Mar. 17-Mar. 26. 



29 50-3 



29 40-1 



29 



45-2 





Mar. 27-April 5. 



29 52-1 



29 39-8 



29 



46-0 





April 6-Aprill5. 



29 50-1 



29 42-1 



29 



46-1 





April 16-April 25. 



29 50-2 



29 42-2 



29 



46-2 





April 26-May 5. 



29 49-9 



29 41-1 



29 



45-5 





May 6-May 15. 



29 47-1 



29 41-6 



29 



44-4 





May 16-May 25. 



29 46-7 



29 42-5 



29 



44-6 





