Boyle’s air pump and hammer: what they have in common

1. Step 1. Boyle’s air pump — has part — Piston. A plunger.
2. Step 2. Piston — uses — Cylinder. A piston slides inside a cylinder, like the plunger of a syringe.
3. Step 3. Cylinder — is part of — Steam hammer. A steam cylinder.
4. Step 4. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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