“Taking an observation at the pole”. In: “The South Pole”, by Roald Amundsen, 1872-1928. P. 112, Volume II, Library Call Number M82.1/99 A529s, NOAA Photo Library.
“Using Amundsen’s diary, Roland Huntford (in The Amundsen Photographs) describes the photo as “Shooting the sun at the South Geographical Pole. Amundsen (left) is holding a sextant. Helmer Hanssen (right) is bending over the artificial horizon, which is a tray of mercury. Amundsen is lining up the direct image of the sun with its reflection in the surface of the mercury.” — [Controversy and more information about this photograph: southpolestation.com]