Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 392
ew of thesebeautiful and interesting ob-jects. The red image, whichcorresponds to the C line ofhydrogen, is by far the bestfor such observations. Whenthe instrument is properlyadjusted, the slit open a little,and the image of the sunslimb brought exactly to itsedge, the observer at theeye-piece of… … Fig. 130. — The Chromosphere and Prominencesseen in the Spectroscope. §502] AREAL, LINEAR, AND ANGULAR VELOCITIES. 373 502. Areal, Linear, and Angular Velocities (supplementary toArt. 249). — The number of units of area (acres or squaremiles) included in the sector of the orbit described in a…
Astronomy · Constellations
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