Women in war. Machine gun production operators. This modern "spinning wheel" would astound our grandmothers, and so would the young woman who operates it. One of America's thousands of skilled women war workers, this young Midwesterner twirls the wheel that controls the drilling of holes in machine gun parts. A skilled machine operator, she formerly processed spark plugs on a similar machine, but turned her efforts to war work when the factory was converted to the manufacture of machine guns. A.C. Spark Plugs