Dating french clocks
A clock is an instrument to measure, keep, and indicate time.
The word clock is derived (via Dutch, Northern French, and Medieval Latin) from the Celtic words clagan and clocca meaning "bell".
Water clocks, also known as clepsydrae (sg: clepsydra), along with the sundials, are possibly the oldest time-measuring instruments, with the only exceptions being the vertical gnomon and the day counting tally stick.
Given their great antiquity, where and when they first existed is not known and perhaps unknowable.
This object can be a pendulum, a tuning fork, a quartz crystal, or the vibration of electrons in atoms as they emit microwaves. Digital clocks display a numeric representation of time.
Some of these are similar to normal analog displays, but are constructed so the hands can be felt without damaging them.
A major advance occurred with the invention of the verge escapement, which made possible the first mechanical clocks around 1300 in Europe, which kept time with oscillating timekeepers like balance wheels.
Spring-driven clocks appeared during the 15th century.
There is a range of duration timers, a well-known example being the hourglass.
Water clocks, along with the sundials, are possibly the oldest time-measuring instruments.