Row of vertical access shafts and rock drill: what they have in common

1. Step 1. Row of vertical access shafts — is part of — Qanat. A chain of shafts for digging and ventilation.
2. Step 2. Qanat — uses — Gravity flow. Water flows by gravity.
3. Step 3. Gravity flow — is used in — IV drip. The solution flows under gravity.
4. Step 4. IV drip — has part — Syringe. A needle.
5. Step 5. Syringe — has part — Piston. A plunger.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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