Knotted log line and needle: what they have in common

1. Step 1. Knotted log line — is part of — Chip log. A knotted rope.
2. Step 2. Chip log — uses — Hourglass. The time of a speed measurement was taken with an hourglass.
3. Step 3. Hourglass — uses — Gravity flow. Sand pours through under gravity.
4. Step 4. Gravity flow — is used in — IV drip. The solution flows under gravity.
5. Step 5. IV drip — has part — Syringe. A needle.
6. Step 6. Syringe — has part — Needle. A hollow needle.

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