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Grinding apparatus,1938

A rectangular bin sits empty at the base of this grinding apparatus.

A rectangular bin sits empty at the base of this grinding apparatus.

This hydraulic press is manufactured by Charles F. Elmes Engineering Works, Chicago.

This is a Fred S. Carver Engineer hydraulic press.

This hydraulic press is manufactured by Charles F. Elmes Engineering Works, Chicago.

This is a Fred S. Carver Engineer hydraulic press.

An Instructor and student run a test on sand and gravel using water and classification table.

An Instructor and student run a test on sand and gravel using water and classification table.

Thomas D. Wheelock and three other men examine a piece of equipment.

Thomas D. Wheelock and three other men examine a piece of equipment.

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