Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLI. No. 24. — February, 1906. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 

 HARVARD UNIVERSITY. 



ON THE MANNER OF GROWTH OF A CURRENT IN THE 

 COIL OF A NEARLY-CLOSED ELECTROMAGNET AS 

 INFLUENCED BY THE WIDTH OF THE AIR GAP. 



By B. O. Peirce. 



