Tide-predicting machine and industrial robot: what they have in common

1. Step 1. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
2. Step 2. Pulley — has part — Wheel. A pulley is a wheel with a groove for a rope.
3. Step 3. Wheel — is part of — Lunokhod. Wheels.
4. Step 4. Lunokhod — evolved into — Mars rover. Planetary rovers.
5. Step 5. Mars rover — has part — Industrial robot. A robotic arm.

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