A small flexible metal box expands and contracts which is connected to the instrument's dial.
Weights activated by air pressure change position according to the weight of the air moving a dial on the instrument.
A spring inside the instrument, connected to a dial, moves when the air pressure contacts the spring.
Mercury inside the barometer rises and falls moving the dial according to the increase or decrease in pressure.
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A small flexible metal box expands and contracts which is connected to the instrument's dial.
In an aneroid barometer, the flexible metal box (called an aneroid cell) changes shape in response to variations in air pressure. As the air pressure increases, the cell compresses; as the pressure decreases, it expands. These movements are then transmitted through mechanical linkages to move the dial, indicating the air pressure.
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