Box flaps and Babbage’s Analytical Engine: what they have in common

1. Step 1. Box flaps — is part of — Cardboard box. Folding flaps.
2. Step 2. Cardboard box — is made of — Wood pulp. Corrugated board.
3. Step 3. Wood pulp — is used in — Paper machine. The raw material.
4. Step 4. Paper machine — is used in — Paper. Industrial production.
5. Step 5. Paper — is material for — Punched card. Punched cards are stiff card.
6. Step 6. Punched card — is used in — Babbage’s Analytical Engine. Operations and numbers were entered on punched cards.

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