THE MAKING of a BIG GUN: The Final Stages of Fitting the Breech Block and Mushroom Plunger
... THE MAKING of a BIG GUN The Final Stages of Fitting the Breech Block and Mushroom Plunger -SPECIAL BIG GUN SECTION NEARING THE END IN THE TASK OF PRODUCING A BIG GUN FOR THE NAVY The problem of securing a gas-tight breech is solved by providing a pad which creates a closely-fitting joint. The explosion of the powder forces back the mushroom plunger as shown here HOW THE INTERRUPTED SCREW ...