Medieval Mechanical Clock

Timeline

1. 1371–1380Northern Italian city-states · ItalyIn the 1370s northern Italian city towers commonly installed gravity-driven mechanical clocks, with falling weights driving gear trains regulated by a foliot; civic authorities used public timekeeping to regulate market openings, craftsmen's hours, and religious observances, making the clock a symbol of urban autonomy and technical prestige.
2. 1370Padua · VenetoThe Paduan physician and engineer Giovanni de' Dondi built a seven-faced astronomical clock, the Astrarium, between 1364 and 1370, displaying the positions of the sun, moon, five planets, and zodiac; in the 1370s he wrote the Tractatus astrarii detailing gear ratios, escapement, and display mechanisms, one of the most complete technical documents of medieval mechanical engineering.
3. 1371–1380Western Europe · Western EuropeMechanical clocks first served monastic canonical hours, but by the 1370s had widely shifted to timekeeping in urban public spaces; bell sounds rang across markets and squares, unifying the rhythm of city life and replacing the limitations of sundials and water clocks on cloudy days and at night, marking time's diffusion from the church to the secular public sphere.
4. 1371–1380Western Europe · Western EuropeThe core technology of 1370s mechanical clocks was the verge escapement with foliot: the escape wheel alternately locked and released the gear train, dividing continuous power into an even beat; blacksmiths and clockmakers' guilds mastered gear cutting, pivot-hole calibration, and weight regulation; though less precise than later periods, it met daily timekeeping and astronomical display needs.