Car battery and Babbage’s Analytical Engine: what they have in common

1. Step 1. Car battery — is made of — Sulfuric acid. The electrolyte is a solution of sulfuric acid.
2. Step 2. Sulfuric acid — is used in — Chemical plant. The first chemical plants produced sulfuric acid and soda.
3. Step 3. Chemical plant — has part — Programmable logic controller. Process control automation.
4. Step 4. Programmable logic controller — evolved from — Relay. It replaced relay cabinets.
5. Step 5. Relay — is part of — Harvard Mark I. The Mark I was electromechanical, built from relays.
6. Step 6. Harvard Mark I — was inspired by — Babbage’s Analytical Engine. Howard Aiken named Babbage’s work as the source of his idea.

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