() F T II i: M A Q N ET I C !■'<) K C E 



11 



The next step of the reduction consisted in transcribing the whole body of the 

 observations after correcting them individually for differences of temperature; the 

 adopted standard temperature being 63° Fahr. 



The following table contains the monthl) means of the bifilar readii gs reduced 



to the standard temperature; the scries has been made continuous by the application 

 of certain corrections explained before. 



The readings are in scale divisions of 0.0000365 parts of the horizontal force; 

 increasing numbers denote decrease' of force. The time is Observatory mean time, 

 counted to twenty-four hours for convenience sake. 



