OF THE MAGNETIC FORCE. 



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 monthly means of the bifilar readings reduced 

 to the standard temperature; the series 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. 



