Newcomb, Simon, 1835-1909, Holden, Edward Singleton, 1846-1914, joint author · New York, H. Holt and Company · leaf 410
a line. Perliaps its formcan be best imagined by supposing the sun to be directlyabove the comet, and a fountain, throwing a liquid hori-zontally on all sides, to be built upon that part of thecomet which is uppermost. Such a fountain would throwits water in the form of a sheet, falling on all… … Fig. 103.—formation op envelopes. To give a clear conception of the formation and motion of theenvelopes, we present two figures. The first of these shows the ap-pearance of the envelopes in four successive stages of their course,and may be regarded as sections of the real umbrella-shaped sur-faces…
Astronomy
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