Reaper

device · 1831 · Industrial Revolution

McCormick’s horse-drawn reaper.

What it is made of

Gear — has part. The knife is driven from the wheel.
Crank — has part. A crank moves the knife.

Principles and materials it uses

Wood — is made of. McCormick’s reaper has a wooden frame.
Iron — is made of. The blades are iron.
Grain — uses. The reaper cuts the grain crops.

History: what it evolved from and what it influenced

Sickle — evolved from. Mechanical reaping.
Combine harvester — evolved into. Reaper + thresher.

Take Reaper apart