![](http://www.alamy.com/thumbs/6/6E501088-C81F-4779-AAB6-8B82589B0A40/KK0JB8.jpg)
Kristian Birkeland eksperimenterer med nordlys i et vakuumkar, 1912 no nb digifoto 20160304 00234 bldsa fPORTRETT 0032
Size: 1780px × 1404px
Photo credit: © Historic Collection / Alamy / Afripics
License: Licensed
Model Released: No
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