210 



MESSRS. C. T. HEYCOCK AND F. H. NEVILLE 



together with the fact that the ratio of R 100 to R is 1'385, enables the observed 

 resistance to be re-calculated for an imaginary wire whose R = 1. The symbols 

 R, R 0) R 100 , are the resistances at the observed freezing point of the alloy, at C. 

 and at 100 C. respectively. 



The number of the alloy referred to is placed before each note. 



