Gimpel provides a classic study of the technology of the Middle Ages. The Industrial Revolution is associated with innovation and invention, but ingenuity and science had not suddenly been discovered. Gimpel looks at the inventiveness of the medieval mind, its rediscovery and application of older methods. He explores the social and economic demands and consequences of technology. An essential read for any writer trying to capture the mood of the times and dispel myths that this was some fantasy age of religion and magic but no science or engineering.