Demainbray's convex lens
1750
1750
2000-100 BCE
1752
circa 1750
1755
1757
1752
1752
1755
1755
1986 (replica); 1501-1600 (original)
1705-1737
before 1753
1752
1752
1751
1752
1752
1755
1990-96
1752
1752
4000-2001 BCE
1888-185
1755
1750
1756
1750
1750
1750
1750
1750
1752
1753
1750
1752-1755
1750
1750
1754
1752
1750
2000-1350
1972-3
1945-50
3000 BCE
1990-95
1800-1600
1753
1753-1754
30 CE