Demainbray's convex lens
1750
1750
1745-1755
2000-100 BCE
1745-1755
1752
circa 1750
1755
1752
1752
1755
1745-1755
1755
1986 (replica); 1501-1600 (original)
1745-1755
1705-1737
before 1753
1752
1752
1751
1752
1752
1745
1755
1990-96
1745-1755
1752
1752
4000-2001 BCE
1888-185
1755
1750
1745-1755
1750
1750
1750
1750
1750
1752
1753
1750
1752-1755
1750
1750
1745-1755
1754
1752
1747-1749
1745
1745
1750