Put this abstract into Google:
"When a current is passed through a ball bearing it can act as a motor. This curious effect was pointed out by Milroy. The present paper gives a theoretical analysis of this effect. The motor can run in either direction on both dc and ac. It can be self-starting on dc. Some experimental results are presented in support of the theory." The second search result has the link: www.physic.ut.ee/instituudid/efti/.../KuullaagerMootorAJP1978.pdf The entire paper can be downloaded by clicking the link as it appears in the search results. It contains lots of math. Harry
