Bessemer converter and typewriter: 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 — is made of — Brick. An open-hearth furnace is built of firebrick.
3. Step 3. Brick — is made of — Clay. Bricks are moulded from clay.
4. Step 4. Clay — is material for — Movable type. Bi Sheng’s type was made of fired clay.
5. Step 5. Movable type — works like — Typewriter. Each typebar carries a piece of movable type pressed against the paper.

Open Evothings