Researches in Magnetic Electricity. 



371 



ber of coils of wire covering the magnets, and lastly in proportion 

 to the rapidity of motion. 



The operation of the magneto-electric multiplier will now be 

 understood at a glance. It is simply an electromagnet, with a 

 revolving armature and break-piece. The revolution of the ar- 

 mature is of course equivalent in its effect, or nearly so, to its rec- 

 tilinear approach and abduction, a is a small compound electro- 

 magnet, 12 inches in length before bent, composed of 500 fine 

 iron wires, covered with 5 superposed coils of large copper wire, 

 No. 16, and 7 layers of fine copper wire, No. 26. 6, c, are the 



