![](https://coimages.sciencemuseumgroup.org.uk/57/139/large_thumbnail_1981_2028__0002_.jpg)
Synchronous mains electric clock of the self-starting type
1934
1934
1935
1936
1935
1935
1936
1935
1934
1934
1936
1935
1935
1934-1935
1935
2000-100 BCE
1936
1935
1955; 1830
1934
1934
1990-96
1936
1935
1936
1935
1934
1935-1936
1934
1936
1935
1935
1839 (original); circa 1988 (replica)
1801-1892 (prepared); 1946 (element replaced)
1935
1935
1903 (original); 1982 (model)
4000-2001 BCE
1935
1934
1935
1830 (original); 1967 (model)
circa 1936
circa 1934
1936
1953-4
1936
1934
1935
1935
1934