SUN INDUCES TERRESTRIAL CURRENTS. 9 1 



weaker, causing the latter to conform in direction 

 about their nearest sides. 



According to this law, as the earth turns on its 

 axis from west to east, and the terrestrial currents 

 move from east to west, we may draw the inference 

 that these terrestrial currents are overpowered by 

 the huge sun-magnet and made to revolve in the 

 same direction as the solar currents, conforming 

 in direction about their nearest sides. The solar 

 currents must therefore move in the same direction 

 in which the sun rotates on its axis, and determine 

 the direction of the axial currents and electro- 

 magnetic polarity of the planets, independently of 

 the direction of their several rotations. 



By changing the position of a bar of iron from 

 a horizontal to an oblique direction, corresponding 

 to the dip of a dipping needle, the bar is instan- 

 taneously rendered an electro-magnet by the ter- 

 restrial currents. 



This bar-magnet will induce corresponding 

 currents in small pieces of iron, as nails and 

 screws, which are also attracted reciprocally to- 

 ward each other. 



The facility with which electric currents change 

 their direction is shown in the artificial current 

 changer, by which they are reversed several 

 thousand times a minute. 



Vibrations directed obliquely, as well as those 

 directed vertically, against molecules and bodies, 

 produce resultant movements at right angles to 

 their surfaces at the point of impact. 



