598 Messrs. Miles Walker and W. Witcomb Stainer on the 



A has been run up to speed and reversed several times, it is 

 found that B is swinging through a bigger angle. Let this 

 be 2 > Then the gain in angular velocity is 



2wn(0 1 --.0 1 ). 



Fig. 4. 







10 



20 



30 



40 



50 



60 

 3 70 

 is 80 



9Q 

 100 



no 



120 



130 

 140 



L 



80 81 82 83 84 85 86 87 88 89 90 



Centimetres deflexion on a scale at 6 metres. 



This multiplied by the moment of inertia of B, 4-2x10% 

 gives the gain in angular momentum. 



In Fig. 4, ^ = 0-17 x 8-33 x 10" 4 radian 



and 6 2 = 0'7 x833xl0- 4 . 



Therefore 



1 







i 





T\ 



! I 





j 









t 





! i 







\\ 1 





! 1 

 j 







'_r 















a 



! 















L 







! 





| 









5 







i 





| 









3 







1 

 i 















z 

















/ 





i 













[ 





1 















j 



4 

















/ 



















( 



5 

















\ 



V 





j 



i 



B T 



0-53 x 8-33 xl0" 4 x 4-2 xl0 6 x 



2tt 

 2460 



= 4*8 grm. cm ./sec. 



The flywheel A has undergone the following changes in 

 anoular momentum : — 



At (1) from 



to + Mr 



(2) „ 



+ Mr to — Mv 



(3) „ 



—Mr to +M.v 



(4) „ 



+ M« to -Mr 



(5) „ 



-Mr to + Mr 



