Arc gap regulator and personal computer: what they have in common

1. Step 1. Arc gap regulator — is part of — Arc lamp. It brings the electrodes together as they burn away.
2. Step 2. Arc lamp — is part of — Street light. The first electric street lights were arc lamps (the “Yablochkov candle”, 1878).
3. Step 3. Street light — has part — LED. LEDs.
4. Step 4. LED — is part of — Computer mouse. An optical mouse.
5. Step 5. Computer mouse — is part of — Personal computer. A mouse.

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