Decades: 1290s 1300s 1310s 1320s 1330s - 1340s - 1350s 1360s 1370s 1380s 1390s
Years: 1341 1342 1343 1344 1345 - 1346 - 1347 1348 1349 1350 1351
... with observations on refraction, on the grinding of "spherical optic glasses," on the errors of lenses and the method of rectifying them, and on the extraction of all ...
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