The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 178
it is neces-sary to have some means of converting solids and liquids intovapor, and also of renderingthe vapors and gases lumi-nous. There are four meth-ods of obtaining luminousvapors and gases in commonuse. (i) By means of the Sun-ken Flame. — This is a veryhot but an almost non-luminous flame.… … Fig. 175. luminous, giving the flame its own peculiar color. The flamethus colored may be examined by the spectroscope. Thearrangement of the flame is shown in Fig. 175. (2) By means of the Voltaic Arc. — An electric lamp isshown in Fig. 176. When this lamp is to be used for obtain-ing luminous…
Astronomy
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