Properties of some Liquid Metals. 



401 



and the other junction first in melting mercury and then in 

 boiling carbon dioxide and ether. As these two deflexions 

 were nearly proportional to their respective temperature-differ- 

 ences, the calibration curve equation was assumed to be of the 

 form, deflexion =at+bt*, where t is the temperature, and a 

 and b constants. These two constants were determined from 

 the two observations, and the calibration curve for the thermo- 



Fig. 2. — Copper-Tin Thermoelement. 



80 



I 



j5 40 



u 



.9 



Eel 



a' 



20 







1 



A' 



7\ 



1 



§i 







/ 



o After quick 

 ■> • After slow 



ccclina 

 cooling 





y 









/ 









200 

 Temperature C. 



300 



element was plotted from the equation. The element and 

 the standard copper wires were insulated as in the last 

 experiment, and bound to the glass tubes dipping into the 

 mercury. The freezing-mixture was contained in a double- 

 walled test-tube, the inner and outer walls being separated by 

 cork distance-pieces, and the whole being wrapped in flannel. 

 The electrical connexions were the same as in the last 

 experiment. 



