Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLIV. No. 19. — May, 1909. 



CONTRIBUTIONS FROM THE ROGERS LABORATORY 



OF PHYSICS, MASSACHUSETTS INSTITUTE 



OF TECHNOLOGY. 



LIL — A PHOTOGRAPHIC STUDY OF MAYER'S 

 FLOATING MAGNETS. 



By Louis Dekr. 



With a Plate. 



