Wooden glazing bars and Babbage’s Analytical Engine: what they have in common

1. Step 1. Wooden glazing bars — is part of — Crystal Palace. Glazing bars of Paxton’s system.
2. Step 2. Crystal Palace — is made of — Cast iron. Cast iron.
3. Step 3. Cast iron — is material for — Babbage’s Analytical Engine. The frame is cast iron.

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