nt problem is to determine the alteration of elevation for firing
up and down a slope. It is found that the alteration of the tangent
elevation is almost insensible, but the quadrant elevation requires the
addition or subtraction of the angle of sight.

Example.--Find the alteration of elevation required at a range of 3000 yds.
in the exchange of fire between a ship and a fort 1200 ft. high, a 12-in.
gun being employed on each side, firing a shot weighing 850 lb with
velocity 2150 f/s. The complete ballistic table, and the method of high
angle fire (see below) must be employed.

[v.03 p.0273]

Range. s. s/C. S(v). v. T(v). t/C. t. T(v_0). v_0
0 0 0 20700.53 2150 28.6891 0.0000 0.000 28.6891 215
500 1500 518 20182.53 1999 28.4399 0.2492 0.720 28.5645 207
1000 3000 1036 19664.53 1862 28.1711 0.5180 1.497 28.4301 199
1500 4500 1554 19146.53 1732 27.8815 0.8076 2.330 28.2853 191
2000 6000 2072 18628.53 1610 27.5728 1.1163 3.225 28.1310 184

Range. v_0. D(v_0). [phi]/C. [phi].[beta]/C. [beta].
0 2150 50.9219 0.0000 0.000 0.0000 0.000
500 2071 50.8132 0.1087 0.315 0.1135 0.328
1000 1994 50.6913 0.2306 0.666 0.2486 0.718
1500 1918 50.5542 0.3677 1.062 0.4085 1.181
2000 1843 50.4029 0.5190 1.500 0.5989 1.734

+---------------------+----------------------------------+
| Charge | weight, 13 lb 4 oz. |
| | gravimetric density, 55.01/0.504 |
| | nature, cordite, size 30 |
+---------------------+----------------------------------+
+---------------------+----------------------------------+
| Projectile | Palliser shot, Shrapnel shell. |
| | Weight, 100lb. |
+---------------------+----------------------------------+
+---------------------+----------------------------------+
| Muzzle velocity | 2154 f/s. |
| Nature of mounting | pedestal. |
| Jump | nil. |
+---------------------+----------------------------------+

A. Remaining Velocity.
B. To strike an object 10 ft. high range must be known to
C. Slope of Descent.
D. 5' elevation or depression alters
point of impact (