﻿188 Sir G. GreenhiU on 



The axle then oscillates between 6 2 and # 3 , 



e,<e<e % , kh=aJ, 



GH 2 = KH 2 + GK 2 = KH 2 + ( 



OC-OGcos<?\ 2 



CH 2 = KH 2 + CK 2 ^KH 2 + ( OG - 00 /°^ ) : 



\ sin / 



sin 6 J 

 = 2OM.MK(E-cos0), 



f-OCcos<9\ 2 



= 2OM.MK(D-cos0). 



Fig. 5. 



When the axle rises to a cusp, rises to 2 , K 2 at the 

 level of G, where in fig. 5 



KH = 0, OG-OCrcos0 2 = O, D=cos0 2 , 



OH 2 = 2 OM . MK (cos <9 2 - cos 6) 



= 20M . MK^5 = 2^ . KC 2 



KH 2 = CH 2 - CK 2 = (2~ -i) CK 2 , 

 giving KH the impulse. 



