Film titled 'Underwater Sentries'. U.S. Coast Artillery troops board a Destroyer Minelayer (DM). Stacked underwater mines in the foreground. DM leaves the dock. Sailors aboard the DM handle mines. Coils of wires on the deck. Sailors on a boat prepare distribution boxes. Cable is connected between the DM and the boat. Mines armed and cables connected from mines to distribution boxes that control firing. Mines are laid by the DM. Animation shows the laying of mines by the DM. (World War II period).
A United States Army Air Corps Douglas XB-19 bomber, originally designated the XBLR-2. Side view from end of right wing of the experimental B-19 bomber aircraft parked on the runway with propellers spinning. XB-19 takes off and flies up over the airfield. Views of the XB-19 in flight, from the ground.
Workers in a brewery in the United States clean away cobwebs and ready equipment at a beer factory to resume beer production after the end of Prohibition. They remove dust and cobwebs from the bottling and brewing equipment. Two workers polish a large brewing tank. A number of dusty beer bottles on a bottling stand. Barrels being loaded on horse carts. A worker brushes the barrels and the horses too.
U.S. Navy pilots keep a cage of pigeon in aircraft. A motor trouble in plane. A man opens the cage. Another man writes a message with information about the plane's forced landing. Men send carrier pigeon with distress signal to the base. Aircraft mechanist works on engine of bomber aircraft. A man at the base takes the message from the pigeon.
United States Navy aircraft in flight. Scouting planes in flight. Ships underway. Planes in formation. Planes lay smoke screen around ships during fleet maneuvers. Fleet behind the smoke screen.
Maiden flight of United States airship Akron. Lieutenant Settle, Navy Chief's inspection staff signs the receipt for the Akron. He congratulates President L.W. Litchfield and Dr. Karl Arnstein. Airship Akron in flight while on its way to Lakehurst.
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