Observations on munition workers, most of them women, are organized to examine the relationship between their output and their working hours. The relationship is nonlinear: below an hours threshold, output is proportional to hours; above a threshold, output rises at a decreasing rate as hours...

Group 1 metal and chemical industries formed the essential suppliers of British war materials during WW2. Their industrial sectors covered metal manufacture, general and electrical engineering, vehicle production, aircraft production, shipbuilding, metal goods, chemicals and explosives, and...