![](https://coimages.sciencemuseumgroup.org.uk/422/417/large_thumbnail_1975_7875__0003_.jpg)
Telegraph block instrument, South Eastern Railway
circa 1905
circa 1905
2000-100 BCE
1872 (original); 1909 (model)
1905
1955; 1830
1934
1905
1705-1737
1772 (original); 1919 (model)
1905
1930 (replica); 1834 (original)
1986 (replica); 1501-1600 (original)
1934
4000-2001 BCE
1801-1892 (prepared); 1946 (element replaced)
1905
1905
1903 (original); 1982 (model)
1830 (original); 1967 (model)
1990-96
1951-1900
1908-1900
1971-1900
1950-1900
1991-1783 BCE
1931-2
1905
circa 1905
circa 1905
1905
circa 1905
1905
circa 1905
17th July 1905
17th July 1905
17th July 1905
17th July 1905
17th July 1905
1905
1905
1905
1905
1905
1905
1905
1905-05-26
1905
circa 1905
circa 1905
circa 1905