Alarm clock
device · 1787 · Industrial Revolution
A clock with a signal (Hutchins).
What it is made of
- Electric bell — has part. A bell.
- Bell — has part. A bell rings.
Principles and materials it uses
- Brass — is made of. The movement is brass.
- Sound wave — uses. An alarm clock wakes you with sound: the bell shakes the air.
History: what it evolved from and what it influenced
- Smartphone — evolved into. The alarm clock moved into the phone.
What it is a kind of
- Mechanical clock — is a kind of. A clock.