The elements of astronomy; a textbook . ravings exist ofperhaps fifty of the most conspicuous of them; but photogra-phy has recently taken possession of the field. The first suc-cess in this line was by Henry Draper of New York, in 1880,in photographing the nebula of Orion. Since his death in1882, great progress hasbeen made, both in Eu-rope and this country,and at present the pho-tographs are continuallybringing out new andbefore unsuspected fea-tures. Fig. 118, for in-stance, is from a photo-graph of the nebula ofAndromeda, taken byMr. Eoberts of Liverpoolin December, 1888, andshows that the
The elements of astronomy; a textbook . ravings exist ofperhaps fifty of the most conspicuous of them; but photogra-phy has recently taken possession of the field. The first suc-cess in this line was by Henry Draper of New York, in 1880,in photographing the nebula of Orion. Since his death in1882, great progress hasbeen made, both in Eu-rope and this country,and at present the pho-tographs are continuallybringing out new andbefore unsuspected fea-tures. Fig. 118, for in-stance, is from a photo-graph of the nebula ofAndromeda, taken byMr. Eoberts of Liverpoolin December, 1888, andshows that the so-called dark lanes, which hith-erto had been seen onlyas straight and whollyinexplicable markings, asrepresented in Fig. 116, are really curved ovals, like the divisions in Saturns photograph brings out clearly a distinct spiral structurepervading the whole nebula, though as yet not satisfactorilyseen by the eye with any telescope. The photographic work of Keeler has shown that greatnumbers of nebulae are of a spiral Fig. 117.—A Spiral Nebula (Keeler). 346 PHOTOGRAPHS OF NEBULJ3. [§471 Thus, in the Pleiades, it has been found that nearly all the largeistars have wisps of nebulous matter attached to them, as indicated bythe dotted outlines in Fig. 115: and in a small territory in and near
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