As the gyro precesses around the Y axis, the spring on the right end of the spin axle will be extended. The stretched spring will then apply a downward force on the end of the axle and,in effect,will apply a force at B and D. Thus force at B and D results in a precessional motion about the Z axis in the direction in which the base is turning. When the gyro is precessing about the Z axis at the same rate of speed as the base is being turned externally,there is no longer any force being exerted at point C and A. This means that the gyro will stop precessing about Y and will hold its position. If,however,the rate at which the base is being turned, once again there will be a force applied at C and D the gyro will precess farther about the Y axis. of course ,the spring being stretched farther will cause a more rapid precession about the Z axis. and this will again match the xternal turning. therefore ,whenever the base is being turned, one of the springs is displaced enough to precess the gyro at rate equal to the rate of turn. whenever the base is stopped, the spring restore the gyro rotor to the neutral position.