Heliostat mirror 100cm square with foresight attached to one corner
1950
1950
1857-1867
1830
1860-1870
1968
1980
1870
1870
1780-1800
1870
1982-84
601-1000
901-1000
1850-1920
1800-1899
1740-1750
1900-1980
1954-1983
1985
1980-1985
1968
1965
1946-1955
1801-1900
1900-1980
1916
1860-1930
1968
1800-1899
1907
1840-1850