Caliper jaws and plumbing: what they have in common

1. Step 1. Caliper jaws — is part of — Vernier caliper. Measuring jaws.
2. Step 2. Vernier caliper — evolved into — Micrometer. A more precise instrument.
3. Step 3. Micrometer — is used in — Interchangeable parts. Precise measurement ensures interchangeability.
4. Step 4. Interchangeable parts — works like — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
5. Step 5. Movable type — is made of — Clay. Bi Sheng’s type was made of fired clay.
6. Step 6. Clay — is material for — Plumbing. Minoan plumbing used ceramic pipes.

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