MACHINE PERFORMANCE CURVE 29 



U(ck c -/' + /) + D^! + D 2 ^ 2 = wl. 

 Also we have of course 



w = L - W 

 D x = T - D 2 



and D 2 



= (L - W)/ 

 - A 2 ) = (L - W)/ 



.-. W/ + T/^ = L[/' - ^ + ^j^] (4) 

 And again as before 



^L = ^unax (5) 



and T=V 4 67W + 2 ) . .(6) 



Now as in the Third Method, equations (2), (3), and (6) can be 

 replaced by 



T R^ R! + R 2 L/V 2 

 V 2 " io 4 io 4 L/D 



L/V 2 = -0051^8 + -005 ik^'B 



io 5 T 



and JL> = - ^- YT*> 



1-39^ V 2 



where B = (i + bj - I. 



Again, as the Third Method, B can be eliminated, leading to 

 the two equations 



, T ., L/V 2 



fj _ A I I 



a V*~ L/D" 



7-2R, , , N 



where # = I - x . . . (a) 



V = R * + 4 R2 . (b'} 



io 4 



' _ 307^! WflAT^ / '\ 



^ 



and ^ 



