Brass samovar tap and vacuum pump: what they have in common

1. Step 1. Brass samovar tap — is part of — Samovar. A tap for pouring.
2. Step 2. Samovar — uses — Combustion. Charcoal in the chimney.
3. Step 3. Combustion — is used in — Greek fire. It burns even on water.
4. Step 4. Greek fire — uses — Piston pump. It was projected by a siphon pump.
5. Step 5. Piston pump — evolved into — Vacuum pump. Guericke adapted the piston pump to pump out air.

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