Researches in Magnetic Electricity. 371 
ber of coils of wire covering the magnets, and lastly in proportion 
to the rapidity of motion. 
WON WIV 
af SIAVG iNva 
‘TeIsOg ‘TMD 
; 
The operation of the magneto-electric multiplier will now be 
Understood at a glance. It is simply an electro-magnet, 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 
