Armoured car and screw press: what they have in common

1. Step 1. Armoured car — evolved into — Tank. The tank combined the armour of an armoured car with the off-road ability of tracks.
2. Step 2. Tank — has part — Tank gun. A gun in a rotating turret.
3. Step 3. Tank gun — has part — Rifling. Rifled tank guns (today often smoothbore).
4. Step 4. Rifling — uses — Screw thread. Helical grooves.
5. Step 5. Screw thread — evolved from — Screw. A thread is an application of the screw.
6. Step 6. Screw — is used in — Screw press. The force is produced by turning a screw.

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