Interchangeable parts and watt steam engine: what they have in common

1. Step 1. Interchangeable parts — is used in — Cotton gin. Whitney was one of the promoters of interchangeable parts.
2. Step 2. Cotton gin — has part — Crank. The drum was turned by a handle.
3. Step 3. Crank — is part of — Watt steam engine. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).

Open Evothings