Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York : H. Holt and company · leaf 302
tive plate have less relative im-portance. THE SUNS PHOTOSPHERE. 281 Again, M. Janssen has noted that in short exposures the photo-graphic spectrum is almost monochromatic. In this way it differs greatly from the visible spectrum, and tothe advantage of the former for this special purpose. The… … FlG. 77.—RETICULATED ABRANGEMENT OP THE PHOTOSPHERE. grams is less than 0-0005. The development of such pictures isvery slow. These photograms, on examination, show that the solar surface iscovered with a fine granulation. The forms and the dimensions ofthe elementary surfaces are very various.…
Astronomy
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