The geometry is defined in Fig (1), and two cases considered: 1) the foot of the gyro is attached to the stand firmly, so it cannot move up and down the Z axis, and 2) the foot is allowed to move up and down the Z axis. In case (1), (Laithwaite experiment), the weightless condition is given by Eq. (20). In case (1), Eqs. (8) to (10) and 16) must be solved simultaneously. In case (2) Eqs. (8) to (10) and (14) must be solved simultaneously.