Decades: 1230s 1240s 1250s 1260s 1270s - 1280s - 1290s 1300s 1310s 1320s 1330s
Years: 1277 1278 1279 1280 1281 - 1282 - 1283 1284 1285 1286s[?] 1287
Births
Deaths
... the groove, while the other end of the axis pushes against the lower rim of the groove. While the axis is slipping around inside the groove, the friction between the axis ...