๐ Inventions and machines ๐ง Machines and tools
Wristwatches
๐ In short
A wristwatch is a small clock we wear on our wrist to know the time anywhere. Before it, people carried watches in their pockets on a chain. Today there are smartwatches that show messages and count your steps and heartbeats!
๐คฉ Did you know?
- A mechanical watch has more than 100 parts.
- Some good watches contain more than 15 tiny jewels.
- Pocket watches were common for more than 200 years.
- A smartwatch is a little computer on your wrist.
๐ Find out more
๐ Pocket watches
Small portable clocks appeared in Europe about 500 years ago, and pocket watches were the most common for more than 200 years. A man would take one out of his pocket and open its cover to check the time.
๐ Inside a mechanical watch
A mechanical watch has a small coiled spring that stores energy and tiny toothed wheels that move steadily. It has more than a hundred tiny parts and some small jewels that reduce friction.
๐ก Quartz watches
Most watches today run on a tiny battery and a quartz crystal that vibrates amazingly evenly, so they're very accurate and cheap.
๐ฏ Special watches
There are waterproof divers' watches, watches that glow in the dark, watches with alarms, and watches for blind people, who feel the hands.
๐ธ More pictures
๐งฉ Test yourself
1 Where do we wear a wristwatch?
2 What do most watches run on today?
3 A mechanical watch has more than ?? parts.
4 Which picture shows โWristwatchesโ?
๐ Discover more
๐ท Picture sources: Wikimedia Commons
- Camwolf12 ยท CC0
- Multicherry ยท CC BY-SA 4.0
- Binarysequence ยท CC BY-SA 4.0
- Philipp Melanchthon ยท Public domain
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