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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.

Five pieces of equipment, including a wooden box, are identified with numbers in preparation for soil testing, May 20, 1940.

Five pieces of equipment, including a wooden box, are identified with numbers in preparation for soil testing, May 20, 1940.

Four men observe a tractor with extra equipment performing work on the soil in a field, for a Rural Minister Short Course, 1961.

Four men observe a tractor with extra equipment performing work on the soil in a field, for a Rural Minister Short Course, 1961.