GYRO STATIC ACTION 



39 



carried in two smaller frames ff and /'/' which are free to turn about 

 the precessioD axles P and V . The axles of spin of the gyrostat 

 wheels are ss and s's', and these axles project as shown at A and A'. 

 The two gyrostat wheels spin in the direction of motion of the hands 

 of a clock as seen from the outer ends of the axles of spin A and A', 

 respectively. The precession axles P and P' are geared together by 

 sectors of gear wheels G and G '. The frame FFFF is hindered from 

 turning about the rocker-axis by the tables H, L, H' and U ; the 

 tables H and L' extend backwards from the plane of the paper, and 

 the tables L and H' extend forwards from the plane of the paper. 



Fig. 37. 



The action of this mechanism is as follows : Suppose side B' of the 

 car body to be the heavier. The pull of gravity on this heavier side 

 produces spin-momentum about the rail W as an axis, and this spin- 

 momentum is absorbed by the precessional motion of the gyrostat 

 wheels, causing both ends of the axles of spin A and A' to move away 

 from the reader in the figure. The unbalanced car, however, in tend- 

 ing to tip over (side B' overloaded), brings the projecting axle A into 

 contact with the table H, the rolling action of the axle A upon the 

 table H hastens the precessional motion, and this hastened precession 

 raises the side B' and lowers the side B of the car-frame, as explained 



