HOLMAN, LAWRENCE, BARE. — MELTING POINTS. 227 



of Holborn and Wien, supported to some extent by considerations 

 advanced by Barus,* lend much weight to the conclusion that Violle's 

 value of 1035° is considerably too low. Granting this, and in the 

 absence of sufficient basis for the assignment of weights to the work 

 of divers other investigators, the simplest and best step seemed to be 

 to adopt provisionally, without modification, Holborn and Wien's 

 value, 



1072°. 



These two points settled upon, the constants m and n could be com- 

 puted as elsewhere described, and the equation transposed to deduce 

 other values of t from observed values of % e. Representing m tq by 

 jB, a constant, the equation for the temperature as a function of Sq e 

 takes the form 



=v/^ 



l+^-273< 



which is, of course, easily solved by logarithms. 



The data given in Table I. yield the values m = 0.3901, n = 1.488, 

 jS — 1645, in international microvolts and degrees centigrade, so that 



2^ = 0.3901 T^-"^- 1645, or <= 1.488 i/?iUlI^ _ 273 



V 0.3901 



From these the temperatures of column six have been computed. 



The constants of the logarithmic formula have been computed from 

 the same data for sulphur and gold, the method being sufficiently 

 obvious. The equation becomes 



2U= 2.49655 f-^\ 



The corresponding melting and boiling points are given in Table I., 

 column seven. 



Substitution of the same data in the Avenarius equation yields 



2^ e = (t^ — Q {9.7385 + 0.00 484 49 (t^ + Q}. 



The corresponding melting and boiling points are given in column five. 



Provisional Values of Melting Points. 



In the paper referred to it was shown, 1st, that the logarithmic 

 expression fitted the Barus comparisons of the irido-platinum couple 

 with the air thermometer within the limits 400° to 1200" C. with no 



* Am. Jour. Sci., XLVIIL 336. 



