278 ADAMS AND JOHNSTON! STANDARD TEMPERATURE SCALE 



of apparatus on the one hand, and with resistance thermometers 

 at the Bureau of Standards or at the Reichsanstalt on the other, 

 agree very satisfactorily. This proves conclusively, that there is 

 no systematic deviation whatever, within the range of these meas- 

 urements, between the readings of these two kinds of thermome- 

 ters — either at boiling points or at melting or freezing points— 

 when both are calibrated with reference to the same temperature 

 scale. This position is confirmed by a direct comparison of the 

 series of measurements by Waidner and Burgess of the resistances 

 of platinum thermometers with the recent gas thermometer 

 measurements of Day and Sosman, 7 transferred by means of 

 thermoelements to the same fixed points. 



So far we have dealt with temperatures less than about 330°; 

 but the comparison just referred to enables us to extend the same 

 conclusion to the copper point (1083°), beyond which the read- 

 ings of the usual form of resistance thermometer are no longer 

 trustworthy. 



TABLE II 

 Boiling Points of Naphthalene and Benzophenone 



7 Am. J. Sci., 29: 93-161. 1910; Carnegie Institution of Washington, Publica- 

 tion No. 157. 1911. cf. also J. Wash. Acad. Sci. 2 : 167-76. 1912. 



