Saw blade and Babbage’s Analytical Engine: what they have in common

1. Step 1. Saw blade — is part of — Saw. A toothed steel blade.
2. Step 2. Saw — evolved into — Chainsaw. A mechanized saw.
3. Step 3. Chainsaw — has part — Sprocket. A sprocket drives the chain.
4. Step 4. Sprocket — works like — Gear. A sprocket resembles a gear, but its teeth engage a chain rather than another wheel.
5. Step 5. Gear — is part of — Babbage’s Analytical Engine. Gears performed the calculations.

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