Winchell, Alexander, 1824-1891 · Chicago, S.C. Griggs and company · leaf 72
No-tices, xxii, 203-7. t Further, on this nebula, see Nature, 22 November, 1877, p. 67, and 18 July,1878, p. 313; Schellen: Spectral Analysis, 534. NEBULA. 43 (Figure 7) presents the form of a sickle or greatly curvedtail of a comet. It seems to be an elongated mass of lightjust beginning a… … Fig 7. Sickle-shaped Nebula, IIekschel 3,239. impossible to gaze upon these figures without feelingthe conviction that a spiral movement is in progress. Thespectra of these nebulae have not been certainly ascer-tained ; but we may venture the conjecture that they willbe found to consist of bright…
Nebular hypothesis · Cosmogony
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