hygrograph

A hygrograph is an instrument used to record the humidity of the air over time. It consists of a pen that moves across a rotating drum of paper, similar to a barograph. The pen is connected to a hygrometer, which measures the relative humidity of the air. As the humidity changes, the pen moves up or down on the paper, creating a graph that shows the fluctuations in humidity over a period.

Hygrographs are commonly used in meteorological stations, laboratories, and industrial settings to monitor and record humidity levels. They provide a visual representation of humidity changes, which can be useful for research, quality control, and environmental monitoring. The recorded data can be analyzed to identify trends, patterns, and anomalies in humidity levels.

Hygrographs can be calibrated to measure humidity in different units, such as percentage relative humidity or dew point. They can also be equipped with additional sensors to record temperature, allowing for the simultaneous monitoring of both humidity and temperature. This makes hygrographs a valuable tool for comprehensive environmental monitoring and data analysis.