The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 203
Fig. 197. Plate II. represents a typical sun-spot as delineated by … Fig. 198. Professor Langley. At the left-hand and upper portions ofthis great spot the filaments present the ordinary appearance, PLATK H. •^ *..^.
Astronomy
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