Sentence Examples with the word packing material

In this the filling material, preferably sand, is sent down from the surface through a vertical steel pipe mixed with sufficient water to allow it to flow freely through distributing pipes in the levels commanding the excavations to be filled; these are closed at the bottom by screens of boards sufficiently close to retain the packing material while allowing the water to pass by the lower level to the pumping-engine which returns it to the surface.

An excellent packing material for dormant buds is coarsely crushed woodcharcoal to which has been added a sprinkling of flowers of sulphur.