Ski tip and tunnelling shield: what they have in common

1. Step 1. Ski tip — is part of — Skis. A bent end.
2. Step 2. Skis — works like — Snowshoes. Two ways of not sinking into snow.
3. Step 3. Snowshoes — is made of — Leather. The webbing was woven from rawhide strips.
4. Step 4. Leather — is material for — Conveyor belt. The first belts were leather.
5. Step 5. Conveyor belt — is part of — Tunnel boring machine. Spoil is removed by a conveyor.
6. Step 6. Tunnel boring machine — evolved from — Tunnelling shield. A development of the tunnelling shield.

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