Reason slot meter, c.1920.
1918-1922
1918-1922
1921
1918
1920
1919
1917
1920
1917
1922
circa 1920
1934
1918
2000-100 BCE
1917-1918
circa 1920
1955; 1830
1918-1920
1918
1921
1918
circa 1920
1920
1920
1919
1990-96
circa 1917
1920
1920-1922
1921
1920
1934
circa 1919
1917
1922
1903 (original); 1982 (model)
1772 (original); 1919 (model)
circa 1920
4000-2001 BCE
1918-1920
1917-1918
1922
1930 (replica); 1834 (original)
1918
1801-1892 (prepared); 1946 (element replaced)
1830 (original); 1967 (model)
1917
1989-08
1919
1919
1922