- The time fuse assembled, ready to be screwed on to the shell proper.
- The top of the fuse which contains the spring and fulminate of mercury cap. The latter explodes from inertia on leaving the gun.
- First ring, with groove filled with powder which burns until it comes to hole in (4). It is ignited by the explosion of the cap in (2).
- Second ring, also filled with powder, which is ignited from (3) and which burns as far as the unit indicated on ring. This ring is set for the second at which it is desired that the shell shall explode over the enemy's lines.
- Base of time fuse. Upper part contains trigger and lower part tube through which the flame passes which explodes the shell itself.
- The covering over last part of passage.
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