Slide rule cursor and plumbing: 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 — Abacus. A counting tool.
4. Step 4. Abacus — is made of — Stone. Counting was done with pebbles — the Latin calculus.
5. Step 5. Stone — is material for — Aqueduct. Aqueducts are stone arches and channels.
6. Step 6. Aqueduct — works like — Plumbing. An aqueduct brings water to a city, plumbing distributes it inside; Minoan pipes are older than the Roman aqueducts.

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