Manometer and windlass: what they have in common

1. Step 1. Manometer — uses — Hydraulics (Pascal’s law). A liquid manometer is a pair of communicating vessels: the difference in levels shows the pressure.
2. Step 2. Hydraulics (Pascal’s law) — is used in — Hydraulic fracturing. Fluid pressure.
3. Step 3. Hydraulic fracturing — uses — Drilling rig. Drilling.
4. Step 4. Drilling rig — has part — Block and tackle. The block and tackle lifts the drill string.
5. Step 5. Block and tackle — is part of — Crane (ancient). The crane lifted loads with a block and tackle.
6. Step 6. Crane (ancient) — has part — Windlass. The rope was wound on a windlass.

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