Brick bottom tubes and newcomen engine: what they have in common

1. Step 1. Brick bottom tubes — is part of — LEGO bricks. Hollow tubes underneath hold the brick by an elastic grip.
2. Step 2. LEGO bricks — uses — Injection moulding. Precise moulding of the parts.
3. Step 3. Injection moulding — uses — Hydraulics (Pascal’s law). Hydraulic presses.
4. Step 4. Hydraulics (Pascal’s law) — is used in — Manometer. A liquid manometer is a pair of communicating vessels: the difference in levels shows the pressure.
5. Step 5. Manometer — is part of — Boiler. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
6. Step 6. Boiler — is part of — Newcomen engine. Steam from the boiler.

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