This collection of nineteen essays, their previous publication dates scattered over a long career, is designed to indicate the velocity and variety of the inventiveness visible in medieval engineering and also to explore the relation of technology to the values of western medieval culture. During the Middle Ages, values and the motivations springing from them--even those underlying many activities that to us today seem purely secular--were often expressed in religious presuppositions. Hence this book's title. The conceptual unity of the collection is brought forth in the author's Introduction, "The Study of Medieval Technology, 1924-1974: Personal Reflections." This title is part of UC Press's Voices Revived program, which commemorates University of California Press's mission to seek out and cultivate the brightest minds and give them voice, reach, and impact. Drawing on a backlist dating to 1893, Voices Revived makes high-quality, peer-reviewed scholarship accessible once again using print-on-demand technology. This title was originally published in 1978 and reissued as a paperback in 1986.