
Anvil type detonators are used with pistols having blunt strikers. There are two classes of anvil type detonators: those which employ a Cartridge Base No. 28, complete with percussion cap and anvil for their initiation, and those in which a percussion cap is housed over an anvil in a recessed plug, which screws into the head of the detonator . These two classes are called the "cartridge-base" and "anvil-plug" classes, respectively. The cartridge base class was used in bombs which are now obsolete, whereas the anvil plug class is currently used in service bombs which employ the anvil type detonator.
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OP 1665, British Explosive Ordnance (1946)