Measurement scale and newcomen engine: what they have in common

1. Step 1. Measurement scale — is part of — Barometer. Millimetres of mercury.
2. Step 2. Barometer — works like — Manometer. Both measure pressure with a column of liquid: a barometer measures the air around us, a manometer the pressure inside a vessel.
3. Step 3. Manometer — is part of — Boiler. The gauge on a boiler shows the steam pressure — without it the boiler could explode.
4. Step 4. Boiler — is part of — Newcomen engine. Steam from the boiler.

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