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Self-propelled combine harvesting crops, right rear view showing crop stalks left behind, 1955
Shown from the right rear, a self-propelled combine harvests crops in Washington County, Iowa, leaving behind shreds of unwanted crop stalks.
Self-propelled combine harvesting crops, right rear view showing grain dust, 1955.
Shown from the right rear, a self-propelled combine takes down crops in Washington County, Iowa, while simultaneously harvesting the grain in a cloud of dust.
Self-propelled combine harvesting crops, rear view showing stalk wastes, 1955
The rear view of a self-propelled combine leaving behind stalk waste of crops being harvested in Washington County, Iowa.
Equipment parts, 1939
Seven equipment parts are displayed.
This lab contains various pieces of equipment. A brick table is in the foreground. A substance is flowing on the floor.
Laboratory cupboard, 1938
This view inside a cupboard shows bottles and glassware filled with various substances.
Chemical processing equipment, 1938
On the right side of the room are two large pieces of equipment. A group of coils are laying against one of the machines. Hoses are laying on the floor. Three wooden structures are in the background.
Agricultural by-products equipment,1938
This piece of equipment is bolted to a concrete table. On the left is a box of assorted valves and other parts and a paint can.
Fisher Scientific instrument, agricultural by-products lab, 1938
At the bottom of this Fisher Scientific instrument there are Pipette and furnace thermostats and switches.
Chemical laboratory, Agricultural by-products, 1938
Various glassware and instruments are displayed on tables and counters in this laboratory. A large cabinet with glass doors is on the left. The door at the rear opens into another laboratory.