Elements of astronomy: accompanied with numerous illustrations, a colored representation of the solar, stellar, and nebular spectra, and celestial charts of the northern and the southern hemisphere (1875)
Lockyer, Norman, Sir, 1836-1920 · New York, D. Appleton and company · leaf 58
beingdivided into twoin a part of its length. But in a larger instrument theappearance is entirely changed. The ring turns into aspiral coil of nebulous matter, and the outlying mass isseen connected with the main mass by a curved band. In the constellations Pisces and Yirgo we have otherexamples… … Fig. 24.—Spiral Nebula in Canes Venatici. 52 NEBULAE.
Astronomy
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