Vinyl record and boiler: what they have in common

1. Step 1. Vinyl record — evolved from — Gramophone. A long-playing record.
2. Step 2. Gramophone — evolved from — Phonograph. A flat disc instead of a cylinder.
3. Step 3. Phonograph — is made of — Tin. The recording is on tin foil.
4. Step 4. Tin — is material for — Ice cream maker. Inside is a tin cylinder.
5. Step 5. Ice cream maker — uses — Latent heat. Ice with salt draws away heat.
6. Step 6. Latent heat — is used in — Boiler. Evaporation needs latent heat.

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