An obscure figure moved a heavy and faintly clanging pile of tamping bars.
"The Three Black Pennys" by Joseph Hergesheimer
He put in the powder and tamping, and asked the other to hand him the tamping-bar.
"Deep Down, a Tale of the Cornish Mines" by R.M. Ballantyne
This allows the dynamite to spread under the pressure of the tamping bar.
"Encyclopaedia Britannica, 11th Edition, Volume 4, Slice 1" by Various