Slide rule cursor and air conditioner: what they have in common

1. Step 1. Slide rule cursor — is part of — Slide rule. A transparent sight with a hairline.
2. Step 2. Slide rule — is a kind of — Computing device. An analogue calculator.
3. Step 3. Computing device — includes — Computer. A computer is a computing device.
4. Step 4. Computer — includes — Server. A computer.
5. Step 5. Server — is part of — Data centre. Thousands of servers.
6. Step 6. Data centre — has part — Air conditioner. Cooling.

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