Pocket watch
device · 1510 · Early modern era
A portable spring-driven watch; early examples are linked to Peter Henlein.
What it is made of
- Mainspring — has part. The mainspring stores the energy.
- Balance wheel — has part. The balance wheel with its hairspring sets the frequency.
- Gear — has part. The wheel train carries energy to the hands.
- Escapement — has part. The lever escapement links the balance and the wheel train.
Principles and materials it uses
- Brass — is made of. The movement of a pocket watch is brass.
- Iron — is made of. The spring and arbors are iron.
History: what it evolved from and what it influenced
- Marine chronometer — evolved into. Harrison moved from large clocks to the pocket-sized H4.
- Wristwatch — evolved into. The watch moved to the wrist.
What it is a kind of
- Mechanical clock — is a kind of. A portable mechanical clock.
- Stopwatch — includes. A specialized watch.