One pound of explosive powder wrapped in paper was pushed into each hole, tamped down, punctured with a sharp needle, and a fuse added.
en.wikipedia.org The mixture is consolidated into a mould using an air-driven, or electric, tamping device or vibration under pressure, which is much like the formation of natural sedimentary rock.
en.wikipedia.org This void was then filled with a much larger charge, which was also tamped, and then blown when required to create a crater as an obstacle.
en.wikipedia.org Some sources even list the goods manufactured by the company, i.e., tamping bars, claw bars, picks, and shovels.
en.wikipedia.org