Question 959Navigation General

The correct answer is D) All of the above. Atmospheric pressure can be measured using any of the three devices listed - an aneroid barometer, a mercurial barometer, or a barograph. All three are commonly used methods for measuring atmospheric pressure as required for Coast Guard Captain's License Examinations. The other options are incorrect because each of the listed devices is a valid instrument for measuring atmospheric pressure. An aneroid barometer uses a sealed capsule to measure pressure changes, a mercurial barometer uses the rise and fall of a mercury column, and a barograph is a recording aneroid barometer that produces a continuous graph of pressure changes.