Lathe tailstock and sickle: what they have in common

1. Step 1. Lathe tailstock — is part of — Lathe. It supports a long workpiece.
2. Step 2. Lathe — has part — Rope. The bowstring wraps around the workpiece and turns it.
3. Step 3. Rope — is part of — Flail. The swingle is joined to the handle by a strap.
4. Step 4. Flail — evolved into — Threshing machine. A replacement for threshing by hand.
5. Step 5. Threshing machine — evolved into — Combine harvester. Combining machines.
6. Step 6. Combine harvester — evolved from — Sickle. The machine replaced reaping by hand.

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