Tower crane
device · 1949 · Digital age
A tall crane for construction.
What it is made of
- Block and tackle — has part. The load is lifted with a block and tackle.
- Electric motor — has part. An electric motor turns the winch.
- Wire rope — has part. The hoist rope.
Principles and materials it uses
- Counterweight — uses. A counterweight balances the jib.
- Steel — is made of. The tower and jib are steel.
History: what it evolved from and what it influenced
- Crane (ancient) — evolved from. The modern crane is a development of the ancient crane with a block and tackle.
What it is a kind of
- Portal crane — includes. A crane.