USCG Meteorology Practice Exam 2026 – The All-in-One Study Resource for Exam Success!

A barograph is an instrument specifically designed to provide a continuous record of atmospheric pressure over time. It operates on the principle of a barometer, which measures atmospheric pressure, but the barograph is equipped with a pen that writes on a rotating drum to chart the changes in pressure, creating a visual record. This allows meteorologists and researchers to analyze pressure trends and variations effectively.

The barometer, while related, does not record pressure continuously; it provides a static reading of air pressure at the moment it is checked. An anemometer measures wind speed and is not involved in pressure measurement at all. Similarly, a thermograph records temperature over time and does not pertain to atmospheric pressure. The distinct functionality of the barograph in recording pressure changes makes it the correct choice in this context.