Question 985Navigation General

The correct answer is B) barograph. A sylphon cell is a type of pressure-sensitive element used in barographs, which are instruments that continuously record atmospheric pressure over time. The sylphon cell expands and contracts in response to changes in air pressure, and this movement is translated into a recording on a chart, allowing for the monitoring and analysis of pressure trends. The other options are incorrect because a maximum thermometer measures the highest temperature reached, a hygrometer measures humidity, and a thermograph is a device that records temperature over time, but none of these instruments utilize a sylphon cell as a key component.