Keith, I definitely understand what you mean about not sharpening a mill cutter that way,
but I have seen some amazing things done by hand by skilled practitioners. She looks deadly
serious, very focused on her work, has a finger wrapped to prevent injury from sharp tools, the draped
bib to keep her cleaner is all old and used, and she has pretty thick glasses on, could easily be
magnifiers to let her see more detail of her work piece.
I wouldn't entirely rule out a highly skilled person actually touching up mill cutters when the
company may have been burning through their supply at an unsustainable rate, can't find
enough new ones in the wartime shortages. We had some women assemblers who could do
truly amazing work with hand tools under magnification. It doesn't look like a posed shot,
but a real, live candid shot of someone doing a dirty, difficult job. Also, double bulbs giving a lot
of light on the subject. I may be wrong, but I wouldn't bet that she wasn't sharpening it,
and maybe was an expert at it.
To me, the lack of a rest of any kind (one is hinged out of the way down very low) is the oddest
part. Perhaps it is some sort of a soft stropping or buffing wheel to do final deburring or polishing
of an edge.
Bill