‎"LOCKYER, JOSEPH NORMAN.‎
‎The Bakerian Lecture. - Recherches in Spectrum-Analysis in connection with the Spectrum of the Sun. No. III. Received November 20, - Read November 27, 1873.‎

‎(London, Taylor and Francis, 1874). 4to. No wrappers as extracted from ""Philosophical Transactions"", Vol. 164 - Part II, Pp. 479-494 a. 3 large folded plates in Heliotype of sun-spectra. Textillustr.‎

Reference : 42992

‎First printing of this paper in which Lockyer analyses the spectra of the sun, comparing them with the spectra obtained of elements on the earth in order to detect the elements in the solar layers. Lockyer was the first to detect Helium in the sun 1868 (printed 1870), and he was a pioneer in the study of spectrum analysis of the sun. ""Joseph Norman Lockeyer (1836-1920), pioneer English astrophysicist. He made importent advances in the field of solar and stellar physics, and is responsible for naming the element helium, for emphasizing the two-branch theory of stellar evolution, and (jointly with Janssen) for the method of observing solar prominences without an eclipsee."" (Source Book in Astronomy).‎