a self-recording hygrometer.
Origin of hygrograph
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This and other types of hygrometer can be arranged to record their own readings continuously, constituting a hygrograph.Meteorology
Charles Fitzhugh Talman
an automatic hygrometer that produces a graphic record of the humidity of the air
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
A hygrometer that records variations in atmospheric humidity.
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