296 On the Systematic Fitting of Curves 
Put y8 = i i^M l" ~ ^) ^ ^ ^^^^ ^^^^ 
~ + 8z = cotz (xviii), 
z 
y 
w 
A 
V 
\ 
k 
/ 
/ 
/ 
V- — 
\ 
\ 
/ 
/ 
■ 
\ 
\ 
< 
J 
/ 
/ 
\ 
< 
\ 
\ 
/ 
/ 
/ 
\ 
\ 
\ 
> 
i — 
1 
1 
-1- 
/ 
/ 
1 
1 
1 
1 
1 
1 

3 

\l 
1 
1 
1- 
1 
'6 -4 -3 -2 -I 0 +1 +2 +3 +4 i- 5 X 
Fig. 4. 
