Tide-predicting machine and saw: what they have in common

1. Step 1. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
2. Step 2. Pulley — is part of — Belt drive. The belt wraps around pulleys.
3. Step 3. Belt drive — works like — Chain drive. A belt and a chain are both flexible links between shafts; the chain does not slip.
4. Step 4. Chain drive — has part — Sprocket. The sprockets engage the chain’s rollers.
5. Step 5. Sprocket — is part of — Chainsaw. A sprocket drives the chain.
6. Step 6. Chainsaw — evolved from — Saw. A mechanized saw.

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