Edelman auger clay-type

Edelman auger, clay type. As wet clay soils are generally strongly cohesive, the blades of this type of auger do not need to be very large. On account of the narrow blades this auger encounters little resistance from the soil. This means that drilling can be carried out with a minimum of force and effort while the resultant sample is hardly
disturbed. Wider blades would cause additional friction and the soil would be difficult to empty out.