Bow drill
device · 8000 BC · Stone Age
A drill turned by a bowstring; also used to make fire.
What it is made of
- Rope — has part. The bowstring wraps around the drill.
Principles and materials it uses
- Friction — uses. It drills and lights a fire by friction.
- Wood — is made of. A bow drill is a wooden bow and spindle.
Where it is used
- Fire making — is used in. The bow drill is a way of making fire.
History: what it evolved from and what it influenced
- Electric drill — evolved into. The oldest rotary drilling tool.