Spear and jacquard loom: what they have in common

1. Step 1. Spear — has part — Stone tool. Early spearheads were made of stone.
2. Step 2. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.
3. Step 3. Hammer — evolved into — Trip hammer. A trip hammer is a hammer lifted and dropped by a water wheel.
4. Step 4. Trip hammer — has part — Cam. Cams on the shaft lift the hammer.
5. Step 5. Cam — is part of — Automaton. Cams set the figures’ movements.
6. Step 6. Automaton — inspired — Jacquard loom. Vaucanson, the maker of automata, built an automatic loom whose ideas Jacquard used.

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