Stone to Silicon

Tools & manufacturing · c. 515 BCE

Crane

Treadwheels and pulleys lift stone blocks far beyond crew strength.

Lifting holes in Greek temple blocks show cranes in use by about 515 BCE. Roman treadwheel cranes could raise several tons and built the ancient and medieval world.

See it in the living treeWikipedia

Arcs above join it to what it stood on, arcs below to what it led to. The bar places this stretch on the tree's whole timeline.

What it built on 2

What it led to 1