SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 85 



Cu ^ 



Fig. 2. — Diagram of electrical connections of copper-nickel thermoelement. 



G — Galvanometer. 



T — Thermoelement junction. 



C — Constant temperature junction. 



Fig. 3. — Bath for constant temperature junction. 



Th — Thermometer. 

 D — Stirring device. 

 K — Kerosene bath. 

 V — Vacuum flask. 



