88 Faraday on New Electro-Ma gnetical Motions., 



and outer surface of the cylinder, would be through the axia 

 of the cylinder round the edge to one side, back up that side, 

 and round to the axis, down which it would go, as before. In 

 this case the force would probably be greatest at the two ex- 

 tremes of the axis of the cylinder, and least at the middle 

 distance on the outside. 



Now consider the internal space of the cylinder filled up 

 by rings or spirals, all having the currents in the same direc- 

 tion : the direction and kind of force would be the same, but 

 very much strengthened : it would exist in the strongest degree 

 down the axis of the mass, because of the circular form, and it 

 would have the two sides of the point in the centre of the sim- 

 ple ring, which seemedio possess attractive and repulsive power* 

 on the pole, removed to the ends of the cylinder ; giving rise to 

 two points, apparently distinct in their action, one being at- 

 tractive, and the other repulsive, of the poles of a magnet. Now 

 conceive that the pole is not confined to a motion about the 

 sides of the ring, or the flat spiral, or cylinder, it is evident that 

 if placed in the axis of any of them at a proper distance for 

 action, it, being impelled by two or more powers in equal circles, 

 would move in a right line in the intersection of those circles, 

 and approach directly to, or recede from, the points before 

 spoken of, giving the appearance of a direct attraction and re- 

 pulsion : and if placed out of that axis, it would move towards 

 or from the same spot in a curve line, its direction and force 

 being determined by the curve lines representing the active 

 forces from the portions of wire forming the ends of the cylinder, 

 spiral, or ring, and the strength of those forces. 



Thus the phenomena of a helix, or a solid cylinder of 

 spiral silked wire, are reduced to the simple revolution of 

 the magnetic pole round the connecting wire of the battery, and 

 its resemblance to a magnet is so great, that the strongest pre- 

 sumption arises in the mind they both owe their powers, as M. 

 Ampere has stated , to the same cause. Filings of iron sprinkled on 

 paper held over this cylinder, arranged in curved lines passing 

 from one end to the other, shewing the path the pole would 

 follow, and so they do over a magnet; the ends attract and re- 



