Public domain
At the testing chamber for motors at the Pratt and Whitney Aircraft Corporation. After the engine is set up inside the chamber the door is sealed tight and the engine run at full blast for hours on end as an engineer watches it thru the window, records its performance as indicated by the instruments
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineAt the testing chamber for motors at the Pratt and Whitney Aircraft Corporation. After the engine is set up inside the chamber the door is sealed tight and the engine run at full blast for hours on en. 1940-01-01. Delano, Jack. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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