Hygrograph | Article about hygrograph by The Free Dictionary
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A recording hygrometer.
an instrument for continuously recording the relative humidity of the air. The sensitive element of a hygrograph is a bundle of degreased human hair or organic film (see HYGROMETER). Recording is done on a calibrated ribbon mounted on a drum, which is rotated by a clock mechanism. The drum on a hygrograph may rotate once a day or once a week.
A self-recording instrument that provides a continuous record of relative humidity on a drum-mounted chart known as a hygrogram
References in periodicals archive
The mean daily temperature (Tmd) was calculated by the following equation that calculates the arithmetic mean of the temperatures ([degrees]C) recorded by the thermos hygrograph
every two hours during the whole day: