HAMBURGER: "ON LI C H T- KM 1 SSI UN OF (iASKS AND MIXTURKS OF GASES CAUSED AT 



ELECT K I C A L D 1 SC H A R( ; ES " 



Spectrum of glowing Tungsten obtained with the aid of the rotating sector - disc etc. on 

 Wratten 4 Wainright's panchromatic - plate (Copper - comparison spectrum). 



ii.jiiiiliii 



;!i:ii!ii!i 



Kig. 2 

 Comparison of the nitrogen-spectrograms, obtained with the 

 aid of the rotating sector-disc, resp. the wedge-method.*) 



*) In the visible part of the wedge spectrograni (spectrvim a, fig. 2) some bands there occur that are wanting in the sector-spectrogram. 

 The time of exposition however was in the latter case much shorter. 



These Proceedings Royal Acad. Amsterdam. VoL XX. 



MELIOTYPE, VAN LEER, AMSTERDAM 



