A popular history of astronomy during the nineteenth century (1902)
Clerke, Agnes M. (Agnes Mary), 1842-1907 · London, A. and C. Black · leaf 222
s, accordingly, filled places in a manner already prepared forthem, and were thus unmistakably associated with the hydrogen-spectrum. This is now known to be represented in prominences bytwenty-seven lines,6 forming a kind of harmonic progression, only 1 Astr. and Astrophysics, vol. xi,, p. 604. 2… … Photographs of the Solau Chromosphere and Prominences. Taken with the Spectroheliograph of the Kenwood Observatory, Chicago,by Professor George K. Bale. chap, iv SOLAR SPECTROSCOPY 199 four of which are visibly darkened in the Fraunhofer spectrum ofthe sun. The chemistry of cloud-prominences is…
Astronomy
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