486 
ARTILLERY IN COAST DEFENCE. 
Note to tables of Fire Commander's Corrections :—These tables can only be 
taken as approximations, they have been amplified from those given in “ Regula¬ 
tions for Practice over Sea Ranges, 1892.” The times of flight are for 9-inch 
R.M.L., and the tide table for an extreme difference of level of 20 feet. Different 
guns and different local conditions as to tide necessitate different tables. Frac¬ 
tions of seconds have been reduced to the nearest half second. In range correction 
tables, times of less than 4 seconds need not be taken into account, as an altera¬ 
tion of range of 50 yards in 4 seconds implies a speed of at least 25 miles per 
hour. 
The following table is given to illustrate remarks made on the subject in the 
lectures. 
— Deflection (approximate) to shift point of impact from the bow to the centre 
of a ship 300 feet long , broadside-on. 
For Range of . 
900 
1300 
1700 
2100 
2500 
2800 
3100 
3400 
3800 
4100 
4400 
Deflection is ... 
3i° 
2£° 
IF 
1*° 
H° 
1° 
1° 
1° 
30 
4 
£0 
4 
SP 
4 
_The Tanges being the same as those which occur in the other tables 
ta facilitate reference. 
