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October 1940. East Hartford, Connecticut. "New type of plating machine being used at the Hamilton Standard Propeller Corporation. It automatically dips the part into the proper solutions for the proper length of time." Acetate negative by Jack Delano. View full size.
This is part of the propeller pitch changing mechanism, as described in this forum post. The curved slot is acted upon by a hydraulic cylinder to rotate the prop blade, changing its angle of attack as needed.
Looks like a Hanson, Van Winkle & Munning plater.
It's the moment he realizes he's going to be replaced by robots.
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