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 Hakky W. Morse. 



With Three Plates. 



INVESTIOATIOKB ON LIGHT AND HeAT MADE OR PUBLISHED, WHOLLY OB IN PABT, WITH APPROPRUTIONS 



FROM THE RCMFORD FuMD. 



