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 or published, wholly or in part, with Appropriations 



from the rumford fund. 



