Lower carbide chamber and knife: what they have in common

1. Step 1. Lower carbide chamber — is part of — Carbide lamp. Calcium carbide.
2. Step 2. Carbide lamp — has part — Valve. It regulates the water supply.
3. Step 3. Valve — is part of — Watt steam engine. A slide valve distributes the steam.
4. Step 4. Watt steam engine — has part — Crank. The stroke of the piston becomes rotation of a shaft (Watt first used a planetary gear).
5. Step 5. Crank — is part of — Meat grinder. A handle.
6. Step 6. Meat grinder — has part — Knife. A cross-shaped blade.

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