Decades: 1160s BC 1150s BC 1140s BC 1130s BC 1120s BC - 1110s BC - 1100s BC 1090s BC 1080s BC 1070s BC 1060s BC
Significant People
... accelerate or brake the spinning gyroscope, with a maximum effect when the axis starts "rolling" inside the groove. (Compare with graphic below.) Since this friction force ...