Imws of the Elementary Voltaic Battery. 59 



It being important, for obvious reasons, to expedite the cooling of 

 the solution, artificial means were employed. 



Our object in the present experiments being merely to establish 

 the remarkable gain of power, with the view to recommend its more 

 frequent use in experiment, rather than its precise rate of effect, no 

 great regularity was observed in the intervals between the successive 

 stages of temperature. 



of an inch apart, and were plunged 



Def. lsteff.+500°. 



166° 



160 



163 



165 



158 



153 



150 



The plates were now removed, and the solution cooled down to 

 190°; this and the succeeding intervals of cooling occupied each 

 about four minutes. 



