This manually set fuze consists of a mechanical delay mechanism in a cylindrical steel case.
On the top of the case is a dial and a setting indicator with arrows showing the direction to turn the indicator.
A knob on the side of the case locks the lid which covers the dial.
A knob in the center of the clock face attachedto the dial sets the clock the required time delay.
A winding post is loacated at the bottom of the case for the accompanying winding key.
Two electric wires to be connected to the electric detonating circuit project from the base of the case.
At the end of the delay period, the clockwork release lever trips the spring loaded striker, closing the circuit and firing the detonator.
This fuze is accurate to within four hours for a 10 day delay setting.

Height: 90mm , diameter: 127mm.