Peck, William G. (William Guy), 1820-1892 · New York, Chicago, A. S. Barnes & company · leaf 285
epulsion these vapors rise in the form of envelopes sur-rounding the comet, and by virtue of the suns repulsionthey are elongated and driven away from the nucleus toform the tail. The manner in which the successive envelopes are formedand driven off is shown in Fig. 102, which represents thehead… … Fig. 102. Coggia1* Comet, 1874. moving under the action of inertia and the suns repellentforce, will describe paths which, for the purpose of descrip-tion, we may regard as normal to the comets orbit. Of allthe particles driven off during a given period, those firstrepelled will have moved to the…
Astronomy
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