Match head and tunnelling shield: what they have in common

1. Step 1. Match head — is part of — Match. Potassium chlorate and sulfur.
2. Step 2. Match — uses — Chemical reaction. The head flares up from a chemical reaction set off by friction.
3. Step 3. Chemical reaction — is used in — Tablet (medicine). A tablet dissolves in the body.
4. Step 4. Tablet (medicine) — uses — Hydraulic press. Tablets are pressed.
5. Step 5. Hydraulic press — has part — Hydraulic cylinder. Two cylinders of different diameters.
6. Step 6. Hydraulic cylinder — is used in — Tunnelling shield. The shield was pushed forward by jacks.

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