Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLII. No. 20.— Ait.ii,, 1007. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD UNIVERSITY. 



THE TRANSMISSION OF RONTGEN RAYS THROUGH 



METALLIC SHEETS 



By John Mead Adams. 



I^'VESTIOATI0NS ON LiQHT AND HEAT MADE AND PUBLISHED, WHOLLY OB IN PAKT, WITH APPEOPRIATION 



FEOM THE RuUfOBD FUND. 



