Rappelling at the Quantico, Virginia Federal Bureau of Investigation (FBI) Academy. An agent throws a rope over the side of a tower and then descends using rappelling techniques. He then demonstrates that he can lock himself using the rope and free both hands to more easily traverse the face of the building.
U.S. Army Air Service or Aviation Section of U.S. Signal Corps cadets undergo aviation training in United States. Buildings in the background. They stand near tables and make gun barrels. They make dummy bombs from plaster of Paris. They also make shells and other World War 1 era armaments.
Measures for the eradication of marine borer in Maryland, United States. The anti fouling paint on the barnacle affects the accumulation of ship plates. U.S. destroyer 116 at harbor. Men stand near the ship. Marine borer grow on the ship. U.S. destroyer 116 at sea. Smoke arises from the stacks of the ship. Marine borer grow on the hub of the starboard propeller. Man watches a ship plate destroyed by the marine borer, painted with a normal paint. The Chemical Warfare Service makes an anti fouling paint to protect the pilings. The paint is applied on the ship plate and man watches the ship plate.
Dramatization: Calcium arsenates spray to combat Boll Weevils in United States. A man addresses the people about the correct use of poison at the Deer Park. He says that only calcium arsenate should be used for the purpose. A man picks some calcium arsenate from a barrel and shows it to people. Men stand near barrels full of calcium arsenate. He puts a sample in a box, wraps it and sends it for its examination to the Government laboratory in Tallulah, La. Chemist determines the composition and fluffiness of the sample. Test glass tubes on the table. The grains studied under microscope and the chemist reports the result showing the certificate.
Airplanes used for dusting poison on the fields in United States. Hiring airplanes avoids labor and mules. A house. Cart dusters in front of the house. Airplanes should be used on fairly level lands. Trees in the background. Man pick cotton bolls and check them in the field. Weevils on tree barks. Men cut the trees.
Airplanes used for dusting poison on fields in United States. Rain washes poison from the plants. A man on cart duster. Another man stands nearby on the field. Airplane useful in muddy areas. Mud on the wheel of the cart duster. Trees in the background.
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