Brass plumb bob weight and stone tool: what they have in common

1. Step 1. Brass plumb bob weight — is part of — Plumb bob. A heavy cone.
2. Step 2. Plumb bob — has part — Rope. A suspension fibre.
3. Step 3. Rope — is part of — Harpoon. A line connects the head to the hunter.
4. Step 4. Harpoon — evolved from — Spear. A spear with barbs.
5. Step 5. Spear — has part — Stone tool. Early spearheads were made of stone.

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