One of four photographs in passe-partout frames of Solar Corona taken with Lyot's "Coronagraph"
1936
Four photographic prints in passe-partout frames of Solar Corona taken with Lyot's "Coronagraph" at the observatory at the Pic du Midi, France, June 22nd 1936 (8 h); July 6th 1936 (8 h); July 7th 1936 (7 h); July 19th 1936 (9 h)
1936
1936
1936
1936