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Time and Calendars · entry 39 of 52
Early mechanical clocks had no faces and simply struck bells to announce each hour.
The longer version
The first tower mechanisms were little more than automated bellringers. A weight descended, an escapement released it in steps, and a train of gears triggered a hammer at each hour. The output was sound, meant to carry across a town where few could read a dial. Maintenance meant winding the weight back up regularly.
Dials came later, and hands later still, because most people reckoned time roughly and only needed the announcement. Striking also worked in darkness and fog. Some towers sounded a distinct pattern for each hour, so listeners could count the strokes without seeing anything. Civic halls competed over whose bell could be heard furthest.
Where this entry sits
These facts wander through clocks, calendars, time zones, and the long human effort to measure passing hours. You will find leap years, odd month lengths, ancient sundials, and the reasons modern timekeeping works the way it does. The full list sits on the Time and Calendars page, where every entry is listed in order.
More From Time and Calendars
Eight more entriesWristwatches became common only in the twentieth century, replacing pocket watches for most people.
Read 41Digital clocks display numbers directly instead of using hands that rotate around a dial.
Read 42Earth's rotation is gradually slowing, so occasional leap seconds keep clocks matched to the planet.
Read 43Most countries use the Gregorian calendar for civil dates and official business.
Read 44The Gregorian calendar was introduced in 1582 to correct drifting dates in the older Julian calendar.
Read 45The Julian calendar added a leap day every four years, which slowly drifted against the seasons.
Read 46When a country switched calendars, people sometimes skipped several days to catch up with the seasons.
Read 47A leap day falls on February 29, giving that date birthdays only once every four years.
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