Babbage’s Analytical Engine and incandescent light bulb: what they have in common

1. Step 1. Babbage’s Analytical Engine — inspired — Harvard Mark I. Howard Aiken named Babbage’s work as the source of his idea.
2. Step 2. Harvard Mark I — has part — Relay. The Mark I was electromechanical, built from relays.
3. Step 3. Relay — is part of — Traffic light. Relay controllers.
4. Step 4. Traffic light — uses — Coal gas. A gas lamp lit the signal.
5. Step 5. Coal gas — is used in — Gas lamp. Coal gas.
6. Step 6. Gas lamp — evolved into — Incandescent light bulb. Electricity displaced gas lighting.

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