![](https://coimages.sciencemuseumgroup.org.uk/57/139/large_thumbnail_1981_2028__0002_.jpg)
Synchronous mains electric clock of the self-starting type
1934
1934
circa 1930
1928
1935
circa 1930
1930
1928
1931
1931
1931
1935
1930
1935
1929-1935
1924
1933
1935
circa 1930
1934
1934
1928
1935
1935
1934-1935
1935
2000-100 BCE
1929-1935
1930-1931
1935
1932
1955; 1830
1932
1933
before 1928
Before 1932
1934
1932
1934
1930-1935
1933
1990-96
1935
1935
1930 (replica); 1834 (original)
1934
circa 1929
1929
1934
1932-1933
1935