«f|n^ arc. die value* of £&£ ab&ei&sgft shk 



The tangent drawn at the point of inflexion cuts off 

 abscissa on the axis OX equal to 4a, The readiest mode 

 tewroximating to the best numerical values of A and a t is 

 IftM&pftrtftg the co-ordinates of the maximum effect .(»*) w 



In Fig. (t-.>6i I have drawn, on a larger scale, the p 

 ■ppi|| et^puiai cubic (1.31) corresponding to. posit 

 valuer of fciva /. a&d Kave A . • ■ ••••••• • 'servatv 



by means of the mi&ti vn\h V 1 - - 'a ., >■ .♦■.^eni between thes 

 and observation la very satiftfaetory. 



Fig. 106. 



