![](https://coimages.sciencemuseumgroup.org.uk/75/34/large_thumbnail_1927_1250__0001_.jpg)
Demainbray's convex lens
1750
1750
2000-100 BCE
1752
1740-1753
1742
circa 1750
1752
1752
1986 (replica); 1501-1600 (original)
1705-1737
before 1753
1752
1752
1751
1752
1752
1745
1740-1753
1990-96
1752
1752
4000-2001 BCE
1888-185
1750
1744
1744
1742
1750
1750
1750
1750
1750
1752
1753
1750
1750
1750
1742
1752
1747-1749
1745
1745
1740
1750
2000-1350
1972-3
1945-50
3000 BCE
1990-95
1800-1600