Note 159 — Chapter VIII · THE SPECTRUM OF SUN-SPOTS.
Reading edition
Frost-Scheiner, Astronomical Spectroscopy, p. 177; J. S. Ames, Astroph. Journ. vol. i. p. 89; Hartley, Proc. Royal Society, vol. lvi. p. 192.
Reading edition
Frost-Scheiner, Astronomical Spectroscopy, p. 177; J. S. Ames, Astroph. Journ. vol. i. p. 89; Hartley, Proc. Royal Society, vol. lvi. p. 192.