Decades: 1150s 1160s 1170s 1180s 1190s - 1200s - 1210s 1220s 1230s 1240s 1250s
Years: 1197 1198 1199 1200 1201 - 1202 - 1203 1204 1205 1206 1207
Births
Deaths
... the gyroscope. Once the gyro is spinning, tipping the device will cause the gyroscope to start precessing, with its axis slipping around in the groove in a circular ...