Question 868Navigation General

The correct answer is D) bring the pointer to its true position. The reason for this is that an aneroid barometer is a mechanical device that measures atmospheric pressure. Over time, the internal components can become slightly misaligned, causing the pointer to not accurately reflect the true pressure reading. Tapping the face of the barometer lightly helps to overcome any sticking or friction in the mechanism, allowing the pointer to move freely and settle at the correct pressure value. The other answer choices are incorrect because they do not accurately describe the purpose of tapping an aneroid barometer. Demagnetizing the metal elements, contracting/expanding the glass face, or exposing loose connections are not the primary reasons for this action.