Tractor
device · 1892 · Electric age
A self-propelled machine for pulling farm implements.
What it is made of
- Diesel engine — has part. A diesel.
- Transmission (gearbox) — has part. A transmission.
Principles and materials it uses
- Steel plough — uses. Ploughing with a tractor.
- Steel — is made of. A tractor is steel and cast iron.
History: what it evolved from and what it influenced
- Watt steam engine — evolved from. The first tractors were steam-powered.
What it is a kind of
- Holt tracked tractor — includes. A tracked tractor.