How are mercury barometer and aneroid barometer arranged?

The aneroid barometer has a small empty box made of two thin elastic plates – membranes. Since there is a void inside this box, the pressure inside it is zero. Atmospheric air pressure compresses the box, but this compression is prevented by a steel spring, which pulls one plate – the membrane from the other and balances the effect of atmospheric pressure. A pointer arrow is connected to the membrane through a transmission mechanism, which can move relative to the scale.

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