EXTRACT FROM "EXPERIMENTAL RESEARCHES." 191 



the perpetual motion also be true ; and it would not be at 

 all difficult, upon the first given case of an electric current 

 by contact alone, to produce an electro-magnetic arrange- 

 ment, which, as to its principle, would go on producing 

 mechanical effects for ever." 



"Royal Institution 



December 26th, 1839" 



