Glass dish bottom and Babbage’s Analytical Engine: what they have in common

1. Step 1. Glass dish bottom — is part of — Petri dish. A flat dish.
2. Step 2. Petri dish — has part — Pot lid. A cap.
3. Step 3. Pot lid — is part of — Saucepan. A cap.
4. Step 4. Saucepan — is made of — Cast iron. Old pots were made of cast iron.
5. Step 5. Cast iron — is material for — Babbage’s Analytical Engine. The frame is cast iron.

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