Knotted log line and bell: 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 — works like — Water clock (clepsydra). The same principle of timing by outflow, with sand instead of water.
4. Step 4. Water clock (clepsydra) — evolved into — Mechanical clock. Mechanical clocks replaced water clocks, swapping the flow of water for an escapement.
5. Step 5. Mechanical clock — includes — Alarm clock. A clock.
6. Step 6. Alarm clock — has part — Bell. A bell rings.

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