Marine chronometer and sickle: what they have in common

1. Step 1. Marine chronometer — evolved from — Pocket watch. Harrison moved from large clocks to the pocket-sized H4.
2. Step 2. Pocket watch — has part — Gear. The wheel train carries energy to the hands.
3. Step 3. Gear — is part of — Lawn mower. The wheels turn the blade cylinder through gears.
4. Step 4. Lawn mower — evolved from — Sickle. Mechanized mowing.

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