Planta química e gutenberg printing press: o que têm em comum

1. Passo 1. Planta química — tem como parte — Programmable logic controller. Process control automation.
2. Passo 2. Programmable logic controller — evoluiu de — Relay. It replaced relay cabinets.
3. Passo 3. Relay — faz parte de — Harvard Mark I. The Mark I was electromechanical, built from relays.
4. Passo 4. Harvard Mark I — foi inspirado por — Máquina analítica de Babbage. Howard Aiken named Babbage’s work as the source of his idea.
5. Passo 5. Máquina analítica de Babbage — foi inspirado por — Jacquard loom. Babbage borrowed Jacquard’s punched cards directly for entering operations and data; Ada Lovelace compared the machine to the Jacquard loom.
6. Passo 6. Jacquard loom — funciona como — Gutenberg printing press. 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.

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