Mid air refueling experiments in January, 1929. A U.S. Army Air Service Douglas C-1 tanker plane, with hose trailing below it, flies above a modified Atlantic-Fokker C-2A named "Question Mark." The hose is let down to the Question Mark, where a crew member seizes it and makes a connection for fuel transfer. After transfer of fuel is complete, the crew member throws the fuel line off and it is retrieved by the tanker plane. The Question Mark lands at Metropolitan Airport, Van Nuys, California on January 7, 1929, and taxiis in to park. The crew members, including Major Carl A. Spaatz, Captain Ira C. Eaker, Lieutenant Harry A. Halverson, Lieutenant Elwood R.(Pete) Quesada, and Staff Sergeant Roy W. Hooe, all exit the airplane and gather under the wing with well wishers. The five crew members pose for photographs beside their airplane, the "Question Mark." Ground crew tows the aircraft with a tractor.
The importance of roads and highways in the development of United States. The Donner Pass built in the northern Sierra Nevade mountains of California. New roads built for the travelers. A monument marks the place where scores of pioneers perished due to starvation and exposure. Monument includes a sculpture of a family and an inscription in their memory.
The annual contest of motorcycle race at Stinson Beach, California, United States. A man flags off a motorcycle race on the Stinson Beach in California. The motorcyclists begin the annual contest of motorcycle race on the beach. The racers wearing goggles ride on a sandy course on the beach. The motorcyclists on the motorcycles racing in high speed.