"LOCKYER, JOSEPH NORMAN - THE DISCOVERY OF HELIUM.Livre Rare Book
Spectroscopic Observations of the Sun.- No. II. Received November 19,- Read November 19 and 26, 1868. (With additional notes Nov. 26, April 9, 1869, Oct. 10, 1869).
187042423(London, Taylor and Sons, 1870). 4to. No wrappers as extracted from ""Philosophical Transactions"" 1869, Vol. 159 - Part I. Pp. 425-444 and 2 lithographed plates (1 with the spectrum of helium, 1 with his spectroscope (not requiring eclipses to function)). Clean and fine.
Herman H. J. Lynge & Son · Copenhagen, Danemark9 500,00 DKK≈ 1 275,85 €