Mushroom
Naval
The peculiar shape resembling a mushroom found attached to the breech plug in all rifled breech-loading cannon. Together with its pads it helps to check the pressure of the gas on the plug when the charge is exploded.
The peculiar shape resembling a mushroom found attached to the breech plug in all rifled breech-loading cannon. Together with its pads it helps to check the pressure of the gas on the plug when the charge is exploded.