"Improvised sounding tackle", i.e. using a hammer with line attached to sound
through the sea ice. In: "The South Pole", by Roald Amundsen, 1872-1928.
P. 234, Volume II, Library Call Number G850 1910 .A62 1912 .
Image ID: libr0354, Treasures of the NOAA Library Collection Photographer: Archival Photograph by Mr. Steve Nicklas, NOS, NGS