, -, DR. E. H. GRIFFITHS AND MR. EZER GRIFFITHS ON THE 



The dotted lines in fig. 7 represent a typical case that of copper at C. with 



thermometer AA. 



It will l noticed that the lines representing the higher rates of supply are 

 markedly to the left of those obtained from the lesser values of n, indicating that the 

 " lag " increases with the rate of supply, as might be expected. 



\ 



I 

 -1 



'x \ X K, **< 389- 

 \ \ 



\ \ 

 \ \ 



\ \ 



\ \ 



v \ 



s \ 



Fig. 7. 



A. study of the " total heat " experiments led us to the conclusion that the " rise 

 above " was intimately connected with this " lag." Although the entire " rise above " 

 on switching off could not be solely due to thermometer lag, yet, as a first 

 approximation, it represents the superior limit. 



Hence, by shifting each line parallel to itself to the right by the value of 6 t 

 determined at the close of the experiment, we obtained the figure shown in full lines, 



1 ^/l _^ 



the result, of course, being the same as if . had been plotted against 6 + O t . 



72- of 



Owing to observational errors, the lines do not intersect in a single point, but 

 enclose a small area. In cases where a really satisfactory series of observations has 

 been obtained, however, the area of the triangle (when three experiments are 

 considered) is vanishingly small even when the results are plotted on such a scale 



