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4. Turn the instrument panel clockwise until it no longer rotates, as shown in Figure 4. The
instrument panel will now be vertically aligned, as shown in Figure 5.
Figure 4
4. Barometer Operation
4.1 How the aneroid barometer works
An aneroid barometer uses a small, flexible metal box called an aneroid cell. This aneroid capsule
(cell) is made from an alloy of beryllium and copper. The evacuated capsule (or usually more
capsules) is prevented from collapsing by a strong spring. Small changes in external air pressure cause
Version 1.0
Figure 3
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Figure 5
Page 3
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