== — CN MEEL EET a 2 RE 
En 2 4M Lm — Lo 
Putting 
Un ®o ==; 
Un Ho 
6 — Um = Sn En Oy 
we obtain 
— Zen — Uo — dn ie En — Um 
na. l 
‘ ‘ 2 * M ‘ Em — Xo 
or 
a 2d 
7) di 
Int =d Lg —— Jd — '°log ———_ = 
aged Tay ee Ago” Sane 
See EE 
u 
2d 
1 ee: 
=— dE elog — 5 
Fi TE 
1-25 
a 
1 
a 
2d 
14+ — d : 
] a - 2de AV ad. 1/20 ria ad 160° 6d" 
0 En ee =e | en Rr mand J — , fe — ee ee ae . . 
je 2d ie ie a ae a Th ea Ba 
a 
Hence 
A af4d  16d'-64A9 Ad*. Tod’ 
lm — va dl =d (9) 
4| a da? Da? da? bat 
or approximately 
ed 4d? 
Um — IES . . - . . . s . (9a) 
oa. 
If the point of inflexion can be determined, at least by a rough 
estimate, a provisional value of d= £— v„ is found. By computing 
a from the formula (9a) we also obtain provisional values for 
a Ea Anr 5 Tes 
2 2 
Finally 2 is found from (7) viz. 
ag 
4M 
== 
