![](https://coimages.sciencemuseumgroup.org.uk/338/821/large_thumbnail_smg00031289.jpg)
Heliostat by Jules Duboscq, 1850-1880
1850-1880
1850-1880
1860-1880
1830-1860
1895
1919
1997
1875-1885
1860-1890
1876
1975-1980
1975-1980
1975-1980
1870-1890
1900-1930
1921-1931
1876
1876
1980-1984
1975-1977
1840-1870
1878
1850-1862
1876
1850-1875
1876
1973
1921
1840-1860