Analytical Study of the Alternating Current Arc. 319 



about eight amperes, and if an alternating current of about 

 two amperes is passed through the armature of the motor, 

 then, on turning the motor rapidly round by hand, which can 



best be done by passing a strap round the shaft and pulling 

 at the strap so as to spin the motor like a top, the motor will, 



Z2 



