( 413 ) 



Ckf 



iO IS 



Fig. 3. 



'2^ 



%S 



Next, we have read the falls of temperature also from a graphical 

 representation ; with a view to the small accuracy of the results I 

 have confined myself to the observations in the strongest field and 

 have omitted the value for ^r = as being unreliable. I then found 



if=±6000 



As the distance from C to the heated place was only 2,37 the 

 value for 2,4 has been extrapolated already. Let us therefore take 

 the value of h 0,6185 as a basis. From the value 0,626 follows a 

 value of a = 0,778; 0,6185 gives a' = 0,801. 



^ = - = 1,058. 



