Precision micrometer screw e Máquina analítica de Babbage: o que têm em comum

1. Passo 1. Precision micrometer screw — faz parte de — Micrometer. A 0.5 mm pitch.
2. Passo 2. Micrometer — é utilizado em — Interchangeable parts. Precise measurement ensures interchangeability.
3. Passo 3. Interchangeable parts — funciona como — Movable type. Movable type is an early case of interchangeable parts: identical letters move from line to line.
4. Passo 4. Movable type — faz parte de — Gutenberg printing press. Text is set from metal type.
5. Passo 5. Gutenberg printing press — funciona como — Jacquard loom. An analogy, not proven influence: both set type and a chain of punched cards are a replaceable pattern that a machine reproduces over and over.
6. Passo 6. Jacquard loom — inspirou — Máquina analítica de Babbage. Babbage borrowed Jacquard’s punched cards directly for entering operations and data; Ada Lovelace compared the machine to the Jacquard loom.

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