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22 results
![[Device used to test synchronization between machine gun and propeller]](https://digitalcollections.museumofflight.org/files/square_thumbnails/12abd3f680a298231b2d6e6ce71ffb65.jpg "[Device used to test synchronization between machine gun and propeller]")
Photograph of a device used to test synchronization between a machine gun and propeller, circa 1918.
![[Chinese soldiers inspecting machine gun]](https://digitalcollections.museumofflight.org/files/square_thumbnails/722f3ff96ff920b17ef892bb0ebbeb73.jpg "[Chinese soldiers inspecting machine gun]")
Photograph of a group of Chinese soldiers inspecting a machine gun, China, circa 1940s.Stamped on verso: "Army Air Force Photo. 10th Combat Camera Unit."