Large spinning drive wheel and newcomen engine: what they have in common

1. Step 1. Large spinning drive wheel — is part of — Spinning jenny. A drive wheel with a handle.
2. Step 2. Spinning jenny — evolved from — Spinning wheel. Many spindles driven by one wheel.
3. Step 3. Spinning wheel — has part — Crank. A foot drive through a crank.
4. Step 4. Crank — is part of — Watt steam engine. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).
5. Step 5. Watt steam engine — evolved from — Newcomen engine. Watt improved Newcomen’s engine.

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