The effect of electric and magnetic fields on spectral lines, by Niels 73082 [Full title: The effect of electric and magnetic fields on spectral lines] [Full author's name: Niels Bohr] [Author: Niels Bohr] [Link: https://www.gutenberg.org/7/3/0/8/73082] [File: 73082-h.htm] Thanks to Laura Natal Rodrigues (Images generously made available by The Internet Archive.) Regards, Al