Explanation of Figures on Page 106
1. French "citron" hand grenade. The cap, which has been removed, is screwed on to one end; before throwing the grenade, the cap is struck with the hand or knocked against some hard object. It explodes six or seven seconds later, and breaks up into as many pieces as there are squares. It is quite similar to the English "Mill's" grenade.
2. French rifle grenade, which has become very popular at the front. It is placed in a little funnel-shaped steel cylinder which fits over the barrel of a rifle; the bullet passes through the center, explodes the cap projecting from the knob on the right, and flies off into the air. The grenade itself is propelled by the escaping gases, and, traveling anywhere from 50 to 200 or 300 yards, is exploded a few seconds afterwards, by the time fuse ignited by the cap.
3. The time fuse and head of a French "75" (3 inch) shell. The fuse is ignited by a cap and trigger within the fuse at the moment the shell leaves the gun. This ignites the powder, wrapped in a spiral coil running from the top of the fuse to the screw on the left. This burns until it comes to the hole punched at the second (time unit mark on the brass covering) at which the shell is to explode. Then the flame passes into the shell itself and explodes the "B. S. P." or high explosive powder by igniting the last big cap.
4. A two pound French trench torpedo which is shot out of a small gun by means of compressed air and hurled a distance of 200 or 300 yards. It is exploded by the fulminate of mercury cap, A, which in turn is set off by the trigger. The ring regulates the position of the latter and the spring keeps the cap and trigger separated.
