‎"LOCKYER, JOSEPH NORMAN.‎
‎On the Photographic Spectra of some of the Brighter Stars. Received November 3, - Read December 8, 1892.‎

‎(London, Harrison and Sons, 1893). 4to. No wrappers as extracted from ""Philosophical Transactions"" Year 1893, Volume 184 - Series A. Pp. 675-726 a. 5 large folded plates showing the spectra of different stars.‎

Reference : 44182

‎First appearance of an importent investigation on stellar physics in which he tries to classify stars according to their spectral differences, deducing differences in temperature etc.etc. ""Lockyer's scheme of stellar development has been modified in many impiortent details, but its basic principle, of both rising and falling temperatures in the life history of a star, is the central idea of our present theories of stellar evolution.""(A Source Book in Astronomy"", p.353).""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).‎