Caliper beam and railway track: what they have in common

1. Step 1. Caliper beam — is part of — Vernier caliper. The main scale.
2. Step 2. Vernier caliper — is made of — Stainless steel. Stainless steel.
3. Step 3. Stainless steel — is material for — Egg beater. A whisk is stainless steel so it does not rust.
4. Step 4. Egg beater — is made of — Tin. The whisk is tinned sheet metal.
5. Step 5. Tin — is material for — Model railway. The first models were tinplate.
6. Step 6. Model railway — uses — Railway track. It runs on rails.

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