Monorail and micrometer: what they have in common

1. Step 1. Monorail — is a kind of — Rail vehicle. Rail transport.
2. Step 2. Rail vehicle — includes — Steam locomotive. A steam locomotive is a rail machine.
3. Step 3. Steam locomotive — has part — Crank. Connecting rods and cranks carry the piston stroke to the wheels.
4. Step 4. Crank — is part of — Cotton gin. The drum was turned by a handle.
5. Step 5. Cotton gin — uses — Interchangeable parts. Whitney was one of the promoters of interchangeable parts.
6. Step 6. Interchangeable parts — uses — Micrometer. Precise measurement ensures interchangeability.

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