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

1. Step 1. Capsule — is part of — Pneumatic tube. A container for letters.
2. Step 2. Pneumatic tube — is a kind of — Postal service. The post.
3. Step 3. Postal service — is used in — Postage stamp. Paying for delivery.
4. Step 4. Postage stamp — is made of — Paper. Paper.
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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