Excavator
device · 1839 · Industrial Revolution
An earth-moving machine; modern ones are hydraulic.
What it is made of
- Hydraulic cylinder — has part. Hydraulic cylinders move the boom and the bucket.
- Continuous track — has part. Most excavators run on tracks.
- Diesel engine — has part. The drive is a diesel.
- Boiler — has part. The first excavators were steam-powered.
Principles and materials it uses
- Wrought iron — is made of. Otis’s steam shovel is iron.