PRACTICES AND RESULTS OBTAINED WITH SAMPLE COLLECTORS FOR WAGON-DRILL CUTTINGS

摘要

The U. S. Geological Survey has experimented with wagon drilling as a low-cost method of subsurface exploration on the Colorado Plateau. The wagon drill is a percussion-type drill mounted on a truck or half¬track. Compressed air is used to operate the drill and to blow the cuttings from the hole. For the collection of the cuttings, three sample collectors have been tested.