https://archive.org/details/elementarylesson00lockuoft/elementarylesson00lockuoft
Elementary lessons in astronomy : Lockyer, Sir Joseph Norman, 1836-1920 : Free Download, Borrow,...
lockyer sir joseph norman
https://www.encyclopedia.com/science/encyclopedias-almanacs-transcripts-and-maps/sir-joseph-norman-lockyer
Sir Joseph Norman Lockyer | Encyclopedia.com
Sir Joseph Norman Lockyer1836-1920 English astronomer who, in 1868, discovered helium, which he found in the sun's atmosphere; its existence on earth was not...
sir joseph norman lockyerencyclopedia