It may come as a shock to discover that there were some great innovations in the Middle Ages, such as the mechanical clock ... take a look at some of these medieval feats of engineering.

Kalamazoo, MI: Medieval Institute, 2012. Time, Measure, and Value in Chaucer's Art and Chaucer's World. With Carolyn P. Collette. Guest-edited issue of Chaucer Review 43.4 (2009). Introduction and ...