Steel milling rollers and gyroscope: what they have in common

1. Step 1. Steel milling rollers — is part of — Roller mill. Pairs of steel rollers crush the grain.
2. Step 2. Roller mill — uses — Belt drive. A belt drive to the roller mills.
3. Step 3. Belt drive — is part of — Spinning wheel. The wheel is linked to the spindle by a cord.
4. Step 4. Spinning wheel — evolved from — Spindle. A wheel turns the spindle.
5. Step 5. Spindle — uses — Angular momentum. Spinning the spindle twists the thread.
6. Step 6. Angular momentum — is used in — Gyroscope. The rotor keeps the direction of its axis.

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