Tampion and Graham lie in Westminster Abbey, because of the accuracy of their work.
"Pushing to the Front" by Orison Swett Marden
Were they meddling with the padlock Dering had put on the tampion which stopped the muzzle of the old gun?
"The Hosts of the Lord" by Flora Annie Steel
This gun can be carried loaded submerged by the use of a watertight tampion and breech.
"The Story of Our Submarines" by John Graham Bower