Soda ash and windlass: what they have in common

1. Step 1. Soda ash — is material for — Soap. An alkali.
2. Step 2. Soap — evolved into — Synthetic detergent. Synthetic detergents were invented in the First World War, when fat for soap ran short.
3. Step 3. Synthetic detergent — is used in — Washing machine. Detergent powder.
4. Step 4. Washing machine — evolved from — Mangle. Early machines had rollers for wringing.
5. Step 5. Mangle — has part — Crank. A handle.
6. Step 6. Crank — is used in — Windlass. The handle of a windlass is a crank.

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