Public domain
Production. Ship propellers, etc. Balancing a giant ship propeller is a difficult job that must be done accurately. Two workmen, their eyes protected by goggles, chip away areas of the manganese bronze blades so that the power of the ship may be put to work efficiently. Baldwin Locomotive Works
From the collection of Library of Congress. Free to download, adapt and use — no permission needed.
Credit lineProduction. Ship propellers, etc. Balancing a giant ship propeller is a difficult job that must be done accurately. Two workmen, their eyes protected by goggles, chip away areas of the manganese bronz. 1942-01-01. United States. Office Of War Information, Rittase, William M.. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.