40fi 



DR. C. CHREE: ANALYSIS OF RESULTS FROM MAGNETOGRAPHS. 



employing local time, found that the phase angles were in every month of the year 

 larger at Kew than at Falmouth in the 24- and 12-hour temperature terms, whilst 

 the Kew angle for the 8-hour term was the larger in eleven months of the year. The 

 mean of the 12 monthly differences between the Kew and Falmouth phase angles 

 from General STKACHEY'S figures are as follows : 



It is thus clear that temperature phenomena near the earth's surface in England 

 are modified by local conditions, such as proximity to the sea coast, in a degree to 

 which there is no parallel in the phenomena of terrestrial magnetism. 



As in (A), all the Fourier coefficients made use of in the paper were calculated 

 directly from the formulae. In the laborious arithmetical work involved in this and 

 in some other parts of the paper I have received valuable assistance from Mr. B. 

 FRANCIS, Assistant in the Observatory Department. Amidst such a multiplicity of 

 figures absolute freedom from error can hardly be hoped for, but all calculations have 

 been gone through at least twice, and every reasonable precaution has been taken to 

 avoid mistakes. 



