|This article does not cite any references or sources. (January
2007)| A Thermo-Hygrograph is a chart recorder that measures and
records both temperature and humidity (or dew point). Similar
devices that record only one parameter are a thermograph for
temperature and hygrograph for humidity. Uses a bi-metallic
strip for temperature and one human hair bundle for humidity.
Includes one red and blue felt –tipped pen to record the
reading. A thermograph is usually configured with a pen that
records temperature on a revolving cylinder. The pen is at the
end of a lever that is controlled by a bi-metal strip of
temperature-sensitive metal which bends as the temperature
changes. |This climatology/meteorology-related article is a
stub. You can help Wikipedia by expanding it.|