The magnetic polarity of sun-spots
By: by George E. Hale, Ferdinand Ellerman, S.B. Nicholson and A.H. Joy ...
Contributors: Ellerman, Ferdinand, 1869-1940, joint author.; Nicholson, Seth B. 1891-1963, joint author.; Joy, Alfred H. 1882-1973, joint author.
Series: Contributions from the Mount Wilson solar observatory,; no 165.
Published: 1919
Place of publication: [Chicago
Language: eng
Number of pages: 26
Subjects: Sunspots.
Notes: Cover title.
Caption title.
At head of title: Carnegie institution of Washington.
"Reprinted from the Astrophysical journal, vol. XLIX, 1919."