Regenerator checkerwork and needle: what they have in common

1. Step 1. Regenerator checkerwork — is part of — Open-hearth furnace. Checkerwork heats the air and gas with the heat of the exhaust gases.
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 — Spinning top. Or shaped from clay.
5. Step 5. Spinning top — has part — Sharp point. A fulcrum.
6. Step 6. Sharp point — is part of — Needle. It pierces the fabric.

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