
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1923
1922
1930
circa 1930
1925
1928
1921
1934
1927
circa 1930
1928
1927
1924
1927
1928
1925
1923
1924-1927
1921
before 1928
1923
1925
1928
1924
1921-1930
1927
2000-100 BCE
1924
1921-1926
1926
1922-1923
1922-1923
1922-1923
1922-1923
1926
1955; 1830
1930
1925
1934
1926-1928
1801-1892 (prepared); 1946 (element replaced)
1930
1927
1924
1839 (original); circa 1988 (replica)
1925
1925
1922-1923