Differential analyser and submarine: what they have in common

1. Step 1. Differential analyser — evolved from — Tide-predicting machine. The ideas of Kelvin’s integrating mechanisms.
2. Step 2. Tide-predicting machine — has part — Pulley. Pulleys add up the harmonics.
3. Step 3. Pulley — is part of — Block and tackle. A block and tackle is several pulleys and a rope.
4. Step 4. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
5. Step 5. Drilling rig — has part — Diesel engine. The drive.
6. Step 6. Diesel engine — is part of — Submarine. Diesel-electric submarines.

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