Replica of the first Morse telegraph, 1835
1934
1934
circa 1900
1900
circa 1900
1900
circa 1900
2000-100 BCE
1900
1872 (original); 1909 (model)
1955; 1830
1900
1900
1990-96
1900
1900
1930 (replica); 1834 (original)
circa 1900
1801-1892 (prepared); 1946 (element replaced)
circa 1900
1775-1799 (original); 1900-1907 (model)
4000-2001 BCE
circa 1900
circa 1900
1934
1839 (original); circa 1988 (replica)
1705-1737
1900
1772 (original); 1919 (model)
1801-1840 (original); 1901 (model)
1830 (original); 1967 (model)
circa 1900s
18 Janury 1948
circa 1900
circa 1900
circa 1900
circa 1900
circa 1900
1900
1900
1900
1900
circa 1900
1900
1825; 1910
1970-1900
1900
1900
1900
1900
1900