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THE POPULAR SCIENCE MONTHLY 



shaft, or, in other words, the engine shaft must push downwards on the 

 bearing a and pull upwards on the bearing b, so that the gyrostatic 

 reaction of the fly-wheel causes the outer wheels 00 of the automobile 

 to be pushed against the ground excessively as the automobile turns 

 round a curve. 



Figs. 11 and 12 represent the case in which the top of the spinning 

 fly-wheel is moving forwards, and Figs. 13 and 14 represent the case 

 in which the top of the spinning fly-wheel is moving backwards. In 

 Figs. 13 and 14 the gyrostatic action of the fly-wheel causes the inner 

 wheels 27 of the automobile to be forced against the ground excessively, 

 as may be seen by studying the vector diagrams in Figs. 13 and 14. 



Fig. 15. 



Fig. 16. 



Figs. 15 and 16 represent the case in which the fly-wheel shaft 

 is parallel to the length of the car. In Fig. 15 the car is represented 

 as turning to the right, the arrow 8 in the vector diagram represents 

 the spin-momentum of the fly-wheel at a given instant, S' represents 

 the spin-momentum at a later instant, AS represents the increment of 

 spin-momentum, and T represents the torque which must act upon 

 the fly-wheel shaft. To produce the torque T, the bearing a must push 

 upwards upon the engine shaft and the bearing b must push downwards 

 on the engine shaft, or, in other words, the engine shaft must push 

 downwards on bearing a and upwards on bearing b. Therefore the 



