
Oxygen cylinder used by climbers on 1953 Mount Everest expedition
1952-3
1952-3
1830 (original); 1967 (model)
1925-1926
2000-100 BCE
1927
1925
1934
1955; 1830
1927
1927
1925
1925
1924
1927
1926
1926
1927
1801-1892 (prepared); 1946 (element replaced)
1930 (replica); 1834 (original)
4000-2001 BCE
1925
1934
1839 (original); circa 1988 (replica)
1925
1925
1925
1903 (original); 1982 (model)
1926
1936
1990-95
1834-1836
1926
1925; 1862
1925
1927
1926
circa 1925
1962-05
1960-1979
1927
circa 1925
1925
1927
1927
1926
1927
1925
1925
1925
1925