Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 187
m the spectrum of many lineswhich we find to be present at our highest temperature. Lockyer maintains that the reason why no trace of the spec-tral lines of certain of our so-called elements is found in thesolar atmosphere is, that these substances are not really elemen-tary, and that the intense… … us, the pitch of its note becomes somewhat higher thanwhen the body is stationary; and, when such a body ismoving rapidly from us, the pitch of its note is loweredsomewhat. We have a good illustration of this change ofpitch at a country railway station on the passage of anexpress-train. The pitch…
Astronomy
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