A quick google flail turned up this image of the plant from roughly that era:

It
also turned up (and I'd have never thought to look for it if you hadn't asked
Ohio AMX) this piece on Hemmings showing inside the plant during the war years:
http://blog.hemmings.com/index.php/2009 ... ght-stuff/It claims to show them pouring magnesium in one of the photos, but I find that a little hard to believe. I've poured magnesium and you do
not want it exposed to air (it has the annoying habit of bursting into flames when it gets hot, you see, and there's a whole lotta nothing you can do to stop it once this happens), so generally you have an inert gas being pumped into the pouring area and while I see what appears to be a compressed gas tank nearby, I
don't see any gas lines running to the ladle or the mold, like one would expect if they were pouring magnesium.