Bulldozer
device · 1923 · Electric age
A tracked tractor with a blade.
What it is made of
- Continuous track — has part. Tracks give traction on the ground.
- Hydraulic cylinder — has part. The blade is raised by hydraulics.
Principles and materials it uses
- Steel — is made of. The blade and frame are steel.
History: what it evolved from and what it influenced
- Holt tracked tractor — evolved from. A bulldozer is a tracked tractor with a blade.