
Chronometer escapement in domed glazed case by William T. Heyes
1903
1903
1904
1911
1905
1903
1901
1901
1934
1930 (replica); 1834 (original)
1801-1892 (prepared); 1946 (element replaced)
1903
1908
1904
4000-2001 BCE
1839 (original); circa 1988 (replica)
1904
1901-1905
1901
1901
1903 (original); 1982 (model)
1907
1903
1901
1905
1903
circa 1905
1668; 1924
1905
1902
1990-95
1902; 1913-1920
1610; 1923
1903
1910
1903
1903
1925; 1862
1936
1909
1910
1908
1910
1907
circa 1905
1834-1836
1908
1903
1908
1901-1907
1910