Slide rule cursor and aerosol can: 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 — Antikythera mechanism. An analogue computing device.
4. Step 4. Antikythera mechanism — is made of — Bronze. The gears are bronze.
5. Step 5. Bronze — is material for — Valve. Ancient taps and valves were bronze.
6. Step 6. Valve — is part of — Aerosol can. A valve.

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