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

1. Step 1. Ski base — is part of — Skis. The underside.
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 — Piston. They were sealed with a leather cup.
5. Step 5. Piston — is part of — Boyle’s air pump. A plunger.

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