Litmus and jacquard loom: what they have in common

1. Step 1. Litmus — evolved into — pH meter. A replacement for indicators.
2. Step 2. pH meter — is made of — Silver. The internal electrode is silver chloride.
3. Step 3. Silver — is material for — Mechanical pencil. Early mechanical pencils were silver.
4. Step 4. Mechanical pencil — has part — Spring. A feed mechanism.
5. Step 5. Spring — is part of — Automaton. The mainspring stores the energy.
6. Step 6. Automaton — inspired — Jacquard loom. Vaucanson, the maker of automata, built an automatic loom whose ideas Jacquard used.

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