102 ADJUSTABLE POINTERS. 
The scale will be somewhat as follows, supposing the upper scale to 
be multiplied about 4 times. If necessary the divisions on the scale 
can be enlarged by multiplying six or eight times. 
Fie. 6. 
1200 1590 1800 2100 24 80 36 42 4800 Cypbs 
| Ly Pal | 
4. 3 2 ! O ins 
| [ 
It is evident that under the present system of non-concentration 
there must be a certain waste of ammunition as the unarmoured portion 
of a ship is rarely as long as the front of a group; and also when 
firing at a vessel advancing towards the battery, unless of great beam, 
3 out of 4 shotsmust miss. The correction of fire also is very puzzling 
for the operators, especially when firing single shots, if they are not 
certain which gun has fired. 
The correction for drift, with full charges could also be allowed for 
in calculating the graduations on the scales of the pointer, as this saves 
the operators a troublesome correction (which indeed has now to be 
neglected up to 4000 yards). 
The correction for drift for reduced charges would necessitate an 
extra pair of scales also graduated for concentration and fixed before- 
hand. A modified amount of concentration could at any time be applied 
by setting the scale for double the range. 
