Decades: 1210s 1220s 1230s 1240s 1250s - 1260s - 1270s 1280s 1290s 1300s 1310s
Years: 1259 1260 1261 1262 1263 - 1264 - 1265 1266 1267 1268 1269
Births
Deaths
... for the device's operation, the groove must not be lubricated. The acceleration of the gyroscope is best when the precession of the gyroscope is supported and amplified by ...