THE VALUE OF A HIGH SITE FOR COAST ARTILLERY. 
223 
TABLE YI. 
Values of n when - = 2. 
a 
9" R. M. L. 10" B. L. 
Range in 
yards. 
Sites ft=0' 
ft = 100' 
Sites ft=0' 
ft = 200' 
Sites ft= O' 
7i=100' 
Sites ft=0 / 
ft=200' 
1000 to 1100 
1*9 
2-8 
3*2 
5-2 
The mean 
value of the 
cotangents 
taken in 
each case. 
2000 to 2100 
1*19 
1*3 
1*53 
2-05 
4000 to 4100 
1*03 
1.07 
1-09 
1*18 
In Table VI. some values of n are tabulated, on the assumption that 
the objective is of the kind most favourable to the low site, that is when 
the value of ^ is as small as possible, viz. 2, and on comparing these 
values of n with simultaneous values of m in Table V. it will be seen 
that they are in all cases smaller. 
In order to verify this method, let us assume that owing to some 
change in its ballistics, the value of m, in the case of the 10" B.L., 
firing at about 4000 yards range, from a height of 100', is 1’08, a 
quantity slightly smaller than that of n, which is 1*09 ; here, then, the 
low site would have the advantage, but if the ratio - were increased, 
this advantage would disappear. The value of when both sites are 
on an equality, in the supposed case, can be found as follows:— 
If x be this value, 
then 
13 + o? 
ll-7+o? 
= 1 *08, 
13+07=12*64 + 1-08#, 
8o? = 36 or 07=4*5. 
To test this, let us take an objective, as in fig. 7, where a is 
represented by 1 and b by 2. 
Fig. 7. 
