146 



Revolving Electric Magnet. 



JYotice of the Revolving Electric Magnet of M. Fiocii, of Paris, in 

 a letter from Dr. Charles T. Jackson, to the Editor, dated 



JVeiv York, Bee. 25, 1832. 



As the preceding papers have no plates to illustrate the descrip- 

 tions, we take the liberty to insert an extract from a letter of Dr. 

 Jackson to the Editor, accompanied by a figure of an apparatus which 

 we suppose to .be, substantially, the same as that by which water was 

 decomposed ; the principal difference appears to have consisted in 

 the greater strength of the magnet used to produce the chemical 

 effects, and in the mode in which the rotation is produced. — Ed. 



" While in Paris, I examined, with Mr. Pixii, a new instrument, 

 lately invented by his son. It may be called a Magnetico-electric 

 machine. As Mr. Pixii deposited a description of this machine at 

 the Academy of Sciences, I have a right to give you some account of 

 it. This machine is a curious invention destined to show the identity 

 of electricity and magnetism, and may, perhaps, in the course of time, 

 supersede the use of the common electric machine and galvanic pile. 

 The annexed sketch will, perhaps, suffice to give you some notion 

 of the construction of Pixii's machine. The one he exhibited was, 

 however, of a different form from that figured here, but as Mr. P. 

 proposed to mount one in this manner, I give it as I suppose he will 

 construct one. 



" A, a horse shoe magnet, composed of six pieces, capable of sup- 

 porting fifty pounds weight. B, a horse shoe multiplicator of soft 

 iron, wound with wire, covered with silk, at the extremities. These 

 wires are prolonged as poles, c, c', one of which is plunged into a cup 



