Touch hole e micrometer: o que têm em comum

1. Passo 1. Touch hole — faz parte de — Hand cannon. Igniting the charge.
2. Passo 2. Hand cannon — evoluiu para — Musket. A hand-held gun.
3. Passo 3. Musket — tem como parte — Trigger. A trigger.
4. Passo 4. Trigger — faz parte de — Revolver. Pulling the trigger turns the cylinder and drops the hammer.
5. Passo 5. Revolver — utiliza — Interchangeable parts. Colt used machine production of interchangeable parts.
6. Passo 6. Interchangeable parts — utiliza — Micrometer. Precise measurement ensures interchangeability.

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