Ship masts and conveyor belt: what they have in common

1. Step 1. Ship masts — is part of — Clipper. Three masts.
2. Step 2. Clipper — is made of — Cotton. The sails are cotton canvas.
3. Step 3. Cotton — is used in — Spinning jenny. It spins cotton and wool.
4. Step 4. Spinning jenny — evolved from — Spinning wheel. Many spindles driven by one wheel.
5. Step 5. Spinning wheel — has part — Belt drive. The wheel is linked to the spindle by a cord.
6. Step 6. Belt drive — is used in — Conveyor belt. The belt runs around the drive and tension drums.

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