BENJ. PIKE'S, JR., DESCRIPTIVE CATALOGUE. 

 Fig. 478. 



passes, by means of which, and the multiplying wheel, /, 

 the armature can be revolved with great velocity. 



The armatures or inductors, as seen at F, are nothing more 

 than electro-magnets ; two pieces of round iron are attached 

 to a cross piece, into the centre of which the spindle, h, 

 screws ; round each of these bars is wound in a continuous 

 circuit a quantity of insulated copper wire, one end being 

 soldered to the round disc, i, the other connected with the 

 copper wire passing through, but insulated from it by an 

 ivory ring. By means of the wheel and spindle, each pole 

 of the armature is brought in rapid succession opposite each 

 pole of the magnet, and that as near as possible without 

 absolutely touching. The two armatures differ from one 



