CHAPTER IV.

GUNNERY.

96. General instructions 142 97. Gunnery terms 142 98. Natures of artillery fire 144 99. Gunnery 145 100. Rifling 147 101. Centring 147 102. Forces acting on a shell in the bore 148

FORCES ACTING ON A SHELL DURING FLIGHT. 103. The resistance of the air 148 104. The force of gravity 149 105. Trajectory 151 106. Elevation 151 107. Causes affecting the accuracy of shooting 154

AMMUNITION. 108. Cordite 155 109. Lyddite shell 157 110. Shrapnel shell 157 111. Star shell 161 112. Time and percussion fuzes 161 113. Fuze indicator 162 114. Range tables 166