Catalysis and micrometer: what they have in common

1. Step 1. Catalysis — is a kind of — Chemical reaction. Speeding up a reaction.
2. Step 2. Chemical reaction — is used in — Percussion cap. Mercury fulminate explodes when struck.
3. Step 3. Percussion cap — is part of — Cartridge. A primer in the case.
4. Step 4. Cartridge — is part of — Revolver. Cartridges.
5. Step 5. Revolver — uses — Interchangeable parts. Colt used machine production of interchangeable parts.
6. Step 6. Interchangeable parts — uses — Micrometer. Precise measurement ensures interchangeability.

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