Equine Hygrometer

horsetail

In 1783, Swiss physicist and geologist, Horace Bénédict de Saussure built the first hygrometer using a human hair to measure humidity. Here on the ranch, we have almost perfected the Equine Hygrometer. When the winds blow in from the desert, the dry air allows the charge on the horse's tails to remain rather than dissipate. The hairs will repel. I have calibrated this against several other hygrometers I keep. In this picture, Bayjinx (bay in foreground) is displaying 13% relative humidity whilst Chester (grey in background) is displaying 11% relative humidity. The concensus amongst all hygrometers on the ranch was 12% relative humidity, so I think the horse tail calibration is getting pretty good.

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