Proceedings of the American Academy of Arts and Sciences. 

 Vol. XLII. No. 8. — July, 190G. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD COLLEGE. 



ON THE CORRECTION FOR THE EFFECT OF THE 

 COUNTER ELECTROMOTIVE FORCE INDUCED IN 

 A MOVING COIL GALVANOMETER WHEN THE 

 INSTRUMENT IS USED BALLISTICALLY. 



By B. Osgood Peirce. 



