Trap (siphon) and parachute: what they have in common

1. Step 1. Trap (siphon) — is part of — Flush toilet. A trap.
2. Step 2. Flush toilet — uses — Gravity flow. Flushing by gravity.
3. Step 3. Gravity flow — is used in — Hourglass. Sand pours through under gravity.
4. Step 4. Hourglass — is used in — Chip log. The time of a speed measurement was taken with an hourglass.
5. Step 5. Chip log — has part — Rope. On a line with knots.
6. Step 6. Rope — is part of — Parachute. The lines are ropes.

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