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

1. Step 1. Electroluminescence — is used in — LED. A p–n junction glows under current.
2. Step 2. LED — is part of — Traffic light. LEDs.
3. Step 3. Traffic light — has part — Relay. Relay controllers.
4. Step 4. Relay — is part of — Harvard Mark I. The Mark I was electromechanical, built from relays.
5. Step 5. 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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