Drip irrigation and saw: what they have in common

1. Step 1. Drip irrigation — has part — Water filter. Water is filtered before the drippers, or the thin tubes clog.
2. Step 2. Water filter — uses — Gravity flow. Water seeps through by gravity.
3. Step 3. Gravity flow — is used in — Water wheel. Falling or flowing water turns the wheel.
4. Step 4. Water wheel — is part of — Sawmill. Early sawmills were driven by water wheels.
5. Step 5. Sawmill — uses — Saw. The cutting tool is a saw.

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