56 TECHNICAL SURVEY 
ool 
ecsseo 
400000 
10000 
10 
EXAMPLE SHOWN ars 
BY DASHED LINES 
h,=4 0 
timc =100,000 
k=i 
Aue 
B is y ot 
4 
fon’c 
7 
7 
7 
7 
7 
a 
77 100000 
1000 
4e@ 
Figure 1 
gram in Figure 4, with a, db, and S as variables. 
For S measured in.units of 1,000 yd, we have 
= - (ats) 
a hare Ones 
Nay? } 
[> - (<x) | Wee ts 
7 + ay sin? 
A typical example for the selected values of 6 is 
shown, as before. 
Finally, we must calculate hz. For heights we have 
fT ee oh; 3 CONE 
(3.281)? (914) (150) (n — b) (— 2 + 3a) 8 
i es ae 
(2) 
