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App. VIIIc.
Appendix
in the opposite direction, and the torque becomes counter-clock; the result of this is a precession of the gyroscope in the opposite sense and a diminution of the clockwise momentum of aspect, until, as shown at (d), nearly the whole of the clockwise momentum is given up, following which the momentum of aspect
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Fig. 205.
becomes counter-clock, (c), and continues to increase until the counter-clock torque falls to zero, when the precession, having reached its maximum value, ceases also, (f). The applied torque then again becomes clockwise, and the condition of the gyroscope returns to that shown in diagram (a) and the whole cycle is repeated.
Trials of this device have shown it to be highly efficient, and it
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