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1275
Mechanical Clock
It was invented in England.
Doesn't have a face and it tells time by striking the hours.
It is less accurate. -
1500
Sundials
Tracks the position of the sun which lets us know the time down to the exact minute.
It is made of a flattened piece of limestone with a semi circle divided into 12 sections on the top. -
1574
Pocket Watch
They were egg-shaped and bulky.
A brass lid was attached to avoid scratches.
The early pocket watches only featured an hour hand. -
Pendulum Clock
This clock increased the accuracy from about 15 minutes to 15 seconds.
Christiaan Huygens used a pendulum for a weight-driven clock with a crown wheel escapement.
In place of a foliot balance, he utilized an isochronal pendulum and placed compensators on both sides to limit the amplitude of the pendulum. -
Stop Watch
The device was a pocket watch that could be stopped by operating a lever.
It was able to measure to an accuracy of 1/5 second. -
Wrist Watch
Women wore these more than men because the watches were prone to damage by the elements. Men usually had pocket watches.
Men in the war started wearing wrist watches to free up their hands.
They usually had a leather band.
They face didn't have glass over it, but it had pierced grill work so you didn't need to open it. -
Electric Watch
The watch used a battery to drive a complex gear train, which pushed the hands. -
Digital Watch
It used a LED display behind a synthetic ruby crystal. The display was so power-hungry that it lit up only temporarily when the user pushed a button on the front of the unit. -
Smart Watch
They can record your daily activity. It is a mini phone on your wrist.
