Propeller Maintenance on Douglas World Cruiser Floatplane (1924)

Mechanics adjusting the wooden propeller of a Douglas World Cruiser seaplane with an officer standing on the pontoon in the foreground. — Propeller Maintenance on Douglas World Cruiser Floatplane (1924) · Donald A. Hall Estate Collection

Standing on the wide wooden float of a Douglas World Cruiser, an officer watches the camera while mechanics adjust the two-blade wooden propeller in front of the frontal radiator. Preserved by Donald A. Hall Sr., this 1924 archival record demonstrates the field maintenance procedures that kept the Liberty engines running around the world.