Bessemer converter and stone tool: what they have in common

1. Step 1. Bessemer converter — evolved into — Open-hearth furnace. A more controllable process.
2. Step 2. Open-hearth furnace — has part — Furnace arched roof. A refractory roof.
3. Step 3. Furnace arched roof — is part of — Oven. The dome holds and reflects the heat.
4. Step 4. Oven — is used in — Bread. Bread is baked in an oven.
5. Step 5. Bread — uses — Quern. Flour was ground on millstones.
6. Step 6. Quern — is a kind of — Stone tool. A quern is two stones: the upper one is turned on the lower to grind grain.

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