350 



Mr. Joule on the Calorific Effects 



I give two series more, in which only one cell was connected 

 with the revolving electro-magnet, and the revolution was in 

 the direction of the attractive forces. The magneto-electricity 



No. 11. 



No. 12. 



Circuits 

 complete. 

 Circuits 

 broken. 



Corrected 

 Result. 



Revolu- 

 tions of 

 Electro- 

 Magnet 



per 

 minute. 



J 600 

 }600 



Deflec- 

 tions of 

 Galvano- 

 meter of 

 1 turn. 



o / 



9 40 



Mean 

 Tempe- 

 rature 



of 

 Room. 



60-40 

 60-64 



Mean 

 Differ- 

 ence. 



0-16- 

 0-17- 



Temperature of 

 water. 



Before. After 



60-02 

 60-47 



60-47 

 60-47 



}6oo rw^{"£S£*xr-} 



Loss or 

 Gain. 



0-45 gain 

 



0-45 gain, 



Was so intense, at a velocity of 600 per minute, as to over- 

 power the intensity of the single cell, causing the needle to be 

 permanently and steadily deflected to between 9° and 10° in 

 the opposite direction. The command of the magneto-elec- 

 tricity over the voltaic current arising from one cell was beau- 

 tifully illustrated by the sparks at the commutator. Turning 



