178 



DR CARGILL G. KNOTT ON THE 



the peculiarity is indicated in the curves, and has been already sufficiently 

 touched upon. 



The Thermoelectric Properties of Hydrogenium. 



So far as I am aware, this subject has never been attacked by any experi- 

 menter. My first inquiry was, therefore, merely as to the existence of a 

 thermoelectric current between pure palladium and hydrogenised palladium. 

 I quite expected to find such a current, but was very much surprised at its 

 magnitude. I cannot do better than quote the whole of the first experiment 

 from my experimental book. 



Resistance of palladium wire before hydrogenisation — 



= '64 ohms. 

 Resistance of same wire after hydrogenisation — 



= -99 ohms. 



The hydrogenium was then bound to a palladium wire, put in circuit with a 

 galvanometer, and the palladium-hydrogenium junction gradually heated in oil 

 up to 300° C, and then allowed to cool. The galvanometer was then gauged 

 by means of a standard Daniell, whose electromotive force was assumed to be 

 1-1 volts. 



The temperatures, with the corresponding deflections, as given in the 

 galvanometer scale, are as follows. The cold junction varied from 6°2 to 8° C. 

 throughout the experiment : — 



Heating. 



Temperature. 



Deflection 



38° C. 



29-3 



67° 



66 



96°-5 



95-5 



121° 



126 



150° 



159 



182° 



183 



200° 



213 



220° 



222 



235° 



224 



240° 



229 



245° 



220 



250° 



220 



255° 



218 



260° 



218 



265° 



220 



270° 



220 



280° 



219 



285° 



218 



290° 



214 



295° 



220 



300° 



218 



Cooling. 



Temperature. 



Deflection 



300° C. 



218 



295° 



191 



290° 



185 



285° 



179 



280° 



171 



275° 



167 



270° 



161 



265° 



157 



260° 



149 



255° 



145 



250° 



138 ' 



240° 



130 



235° 



125 



230° 



122 



220° 



111 



210° 



101 



200° 



94 



175° 



80 



170° 



75 



155° 



71 



120° 



56 



90° 



40 



