Dr. Clarence Bockhop experiments with grading sand in the soil bin using scale model implements and similitude principles to study soil-tool interaction.
Dr. Clarence Bockhop experiments with grading sand in the soil bin using scale model implements and similitude principles to study soil-tool interaction.
A group of students are seated at tables working at drafting projects. Various pieces of drafting equipment are on the tables including right angel triangles, levels and a Thacher�s Calculator (cylindrical slide rule).
A group of students are seated at tables working at drafting projects. Various pieces of drafting equipment are on the tables including right angel triangles, levels and a Thacher�s Calculator (cylindrical slide rule).
