Young, Charles A. (Charles Augustus), 1834-1908, Young, Anne Sewell, b. 1871., ed · Boston, New York [etc.] Ginn and Company · leaf 392
exact measurement isvery delicate and difficult, and is embarrassed by the recently discov-ered fact that the wave-lengths of the rays from a luminous gas areslightly increased by pressure. 501. How the Spectroscope enables us to see the Chromosphereand Prominences without an Eclipse (supplementary… … Fig. 129. — Spectroscope Slit ad-justed for Observation of theProminences. When we point the telespectroscope (Art. 194) so that the sunsimage falls as shown in Fig. 129, with its limb just tangent to theedge of the slit, then if there is a prominence at that point we shallget two overlying…
Astronomy · Constellations
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