Crossbow and electrical telegraph: what they have in common

1. Step 1. Crossbow — evolved from — Bow and arrow. A bow on a stock.
2. Step 2. Bow and arrow — has part — Rope. The bowstring is a cord of sinew or fibre.
3. Step 3. Rope — evolved into — Wire rope. A steel counterpart of rope.
4. Step 4. Wire rope — uses — Wire drawing. The wire is drawn.
5. Step 5. Wire drawing — is used in — Copper wire. Drawing.
6. Step 6. Copper wire — is part of — Electrical telegraph. Communication lines.

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