Bucket elevator and camera: what they have in common

1. Step 1. Bucket elevator — is part of — Grain elevator. A bucket lift.
2. Step 2. Grain elevator — has part — Watt steam engine. Dart’s first elevator was steam-driven.
3. Step 3. Watt steam engine — has part — Piston. Steam pushes the piston in the cylinder.
4. Step 4. Piston — is part of — Bubble chamber. It releases pressure.
5. Step 5. Bubble chamber — has part — Camera. Photographing the tracks.

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