Proceedings of the American Academy of Arts and Sciences. 

 Vol. XXXIX. No. 21. — May, 1904. 



CONTRIBUTIONS FROM THE JEFFERSON PHYSICAL LABORATORY, 



HARVARD UNIVERSITY. 



SPECTRA FROM THE WEHNELT INTERRUPTER. 



By Harry W. Morse. 



With Three Plates. 



Investigations on Light and Heat made oe published, wholly oe in paet, with Appropeiations 



from the rumford fond. 



