Beam and boyle’s air pump: what they have in common

1. Step 1. Beam — is part of — Overhead crane. An overhead crane runs along a beam bridge under the workshop roof.
2. Step 2. Overhead crane — has part — Block and tackle. A block and tackle.
3. Step 3. Block and tackle — is part of — Drilling rig. The block and tackle lifts the drill string.
4. Step 4. Drilling rig — has part — Diesel engine. The drive.
5. Step 5. Diesel engine — has part — Piston. Pistons move in the cylinders.
6. Step 6. Piston — is part of — Boyle’s air pump. A plunger.

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