Brass samovar tap and hollerith tabulator: 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 — Hot air balloon. A fire heated the air inside.
4. Step 4. Hot air balloon — is made of — Paper. It was lined with paper on the inside.
5. Step 5. Paper — is material for — Punched card. Punched cards are stiff card.
6. Step 6. Punched card — is used in — Hollerith tabulator. The 1890 census data was encoded on punched cards.

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