Hourglass neck and tank: what they have in common

1. Step 1. Hourglass neck — is part of — Hourglass. A narrow neck sets the rate.
2. Step 2. Hourglass — uses — Gravity flow. Sand pours through under gravity.
3. Step 3. Gravity flow — is used in — Water wheel. Falling or flowing water turns the wheel.
4. Step 4. Water wheel — evolved into — Turbine. The water turbine evolved from the water wheel.
5. Step 5. Turbine — is part of — Gas turbine. A turbine.
6. Step 6. Gas turbine — is part of — Tank. Some tanks (T-80, Abrams) have a gas turbine engine.

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