Releasing a balloon at the airport in Washington, D.C. in order to determine wind direction and velocity. 1943.
Photo by Fred Driscoll. [American Memory link]
Showcasing some of the 160,000 images taken between 1935 and 1944 by government-hired photographers. (If you were to look at 100 of them per day, every day, you'd need more than four years to view them all).