Bamboo tube and dewar flask: what they have in common

1. Step 1. Bamboo tube — is part of — Fire lance. A barrel with a gunpowder charge.
2. Step 2. Fire lance — is made of — Paper. The barrel of a fire lance is a paper or bamboo tube.
3. Step 3. Paper — is material for — Colossus. The data is on paper punched tape.
4. Step 4. Colossus — has part — Vacuum tube. About 2,500 vacuum tubes.
5. Step 5. Vacuum tube — uses — Vacuum. Electrons fly in an evacuated bulb.
6. Step 6. Vacuum — is used in — Dewar flask. A vacuum.

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