Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 204
Fig. Plate II. represents a typical sun-spot as delineated by a nOnn .^^^ RjPJT JRI m ^mKmm ?Vm •&■ Jflfi H»f *f J3 HI ■c3Pv>-< m^^i^ysS^^^Ss^^^H Mfrfe jz: ■.?$• ^mi HKfedKf <5pf~w ^^«p^^S^^*^i^^^l — ■* ^mNIsi sS#s^ ~^-~ jBsiifir IP* Fig. 198. Professor Langley. At the left-hand and… … :vv^
Astronomy
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