Decades: 1260s 1270s 1280s 1290s 1300s - 1310s - 1320s 1330s 1340s 1350s 1360s
Years: 1309 1310 1311 1312 1313 - 1314 - 1315 1316 1317 1318 1319
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... below.) Since this friction force is essential for the device's operation, the groove must not be lubricated. The acceleration of the gyroscope is best when th ...