Intended as an overview of available secondary works on non-calendrical timekeeping instruments. Grouped into the following categories:
Time in the Medieval World by 
Time's Pendulum: the quest to capture time-- from sundials to atomic clocks by 
Greek and Roman Sundials by 
Monks, Manuscripts and Sundials by 
The Sun in the Church by 
Shadow on the Steps: : time measurement in ancient Israel by 
Le disque de Qumrân by “The material culture of astronomy in daily life: sundials, science, and social change" by “Vertical dials of the 5–15th centuries” by 
Miniature de "Horologium Sapientiae" vers 1450 de Henrich Seuse
Bibliothèque Royale Albert, Bruxelles MS. IV, f. 111
History of the Hour: clocks and modern temporal orders by 
Revolution in Time: clocks and the making of the modern world by +from+about+1450.jpg)
Time: the greatest innovator : timekeeping and time consciousness in early modern Europe by "Changing Times: The Mechanical Clock in Late Medieval Literature. " by The pulse of time : Galileo Galilei, the determination of longitude, and the pendulum clock by “Monasticism and the first mechanical clocks” by
Giovanni Cassini. Heliometer in the Church of San Petronio in Bologna (1695)
Caltech. RB-GC1695-2
