Dear forum members,
The photos show the artillery shell case with electric ignition. The primer sleeve with electrical ignition primer is mounted at the bottom of the artillery shell case. The main part of modern artillery systems operates on the principle of an electric ignition.
Indeed, some large caliber cartridges can be equipped with a flash tube, which provides ignition of the propellant in its central portion. The ignition of propellant in its central portion in some cases allows improving the ballistic characteristics of the shot. But this does not apply to large caliber artillery shells.
The propellant of large caliber artillery shells represents a combination of long powder tubes linked in a beam. This propellant cannot be ignited directly from the primer. To ignite the propellant, an additional igniter charge is used, which is located at the bottom of the artillery shell case and represents a black powder sewn into a cloth bag.