Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 168
hed from the photosphere and drawn in-ward amongst the gases that form the nucleus. Accordingto this view, the crowding together of the photosphericfilaments as they are drawn inward would account for thegreater brightness of the penumbra in the neighborhood ofthe nucleus. Sometimes the filaments… … Fig. 73. Sun Spot. Drawn by Nasmyth. Fig. 73 represents a sun-spot drawn by Nasmyth. It shows the mottling pro-duced by the intersections of forms shaped like willow leaves. It also shows themanner in which spots are often cut up and divided by bridges and prolongationsof the penumbral filaments.…
Astronomy
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