VALUE OF MAGNETIC ELEMENTS AT TORONTO 



263 



MONTHLY ABSOLUTE VALUES OF THE MAGNETIC ELEMENTS 

 AT TORONTO, 



From 1865 to 1868 inclusive, with the Annual Means from 1841 to 1868, 



BY G. T. KINGSTON, M.A., 



DIKECTOE OF THE MAGNETIC OBSERVATORY. 



In the Canadian Journal for 1865 the absolute values of the magnetic elements 

 at Toronto were given for each month of the years 1856 to 1864, as -well as the 

 annual means (as far as they could be procured), from 1841 to 1864. 



The following tables shew the monthly means from 1865 to 1868, and the 

 annual means from 1841 to 1868. The methods employed in the determination 

 of the several elements are the same as those explained in the earlier Toronto 

 volumes. 



Declination. — The annual means of the Declination from 1841 to 1851 are 

 reprinted from Vols. I. and II. of the Toronto observations. In 1853, '54, '65, 

 approximate annual means are obtained by taking the averages of the results 

 for the months wherein observations were made, each monthly result being 

 corrected for annual variation and secular change, as explained on p. 115 of the 

 Canadian Journal for 1865. 



Inclination. — The annual means of the Inclination for the years 1841 to 

 1854 are reprinted from the 3rd Toronto volume, p. cxix. 



The decrease of the Inclination since its maximum in 1859 is materially 

 interrupted in 1868; but that the interruption does not amount to a reversal is 

 rendered probable from the subsequent determinations, the mean of which from 

 January, 1869, to May, 1869, inclusive, is 75° 16^.4 nearly. 



Horizontal Fokcb. — The annual means of the Horizontal force from 1845 to 

 1852, are reprinted from p. cxvii. of the 3rd Toronto volume. The value given 

 as the annual mean for 1855 is an approximation derived from the four months 

 September to December. 



MONTHLY ABSOLUTE VALUES OF THE MAGNETIC ELEMENTS AT TORONTO, 

 FROM 1865 TO 1868 INCLUSIVE. 



