Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLVII. No. 8. — November, 1911. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL 

 LABORATORY, HARVARD UNIVERSITY. 



THE VON WALTENHOFEN PHENOMENON IN SOFT 



IRON RINGS. 



\ 



By Louis A. Babbitt. 



With a Plate. 



