Wheel head and programmable logic controller: what they have in common

1. Step 1. Wheel head — is part of — Potter’s wheel. A spinning disc for shaping.
2. Step 2. Potter’s wheel — is used in — Pottery. The wheel made shaping vessels faster and more even.
3. Step 3. Pottery — uses — Kiln. Firing in a kiln makes clay strong.
4. Step 4. Kiln — is used in — Brick. Fired brick is stronger than mud brick.
5. Step 5. Brick — is material for — Chemical plant. The furnaces and towers are brick.
6. Step 6. Chemical plant — has part — Programmable logic controller. Process control automation.

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