Fathoming Captain Scoresby’s Ten-gallon Fir-Cask

In 1810, in the Greenland Sea, William Scoresby Jr., the captain of Resolute, who was 21 years old, used an oceanographic instrument made from a ten-gallon wooden cask. It was built following Sir Joseph Banks’s instructions — he had sailed with Captain Cook, who also served as President of the Royal Society for 40 years. The cask…