Vintage `Whirling Hygrometer/Psychrometer` and Leather Case

Vintage 'Whirling Hygrometer/Psychrometer' and Leather Case

This unusual, portable British instrument from the 1940's, was made by 'Casella' in London, and was used to determine the relative humidity. It consists of two wooden framed thermometers, a small, mounted water reservoir on the side and a spinning wooden handle. It comes with its original leather case and strap and is stamped on the side 'CASELLA LONDON' 'MADE INENGLAND'. The instrument measures 22cm x 6cm (16,5cm with handle), and along with its case is in excellent condition.

Note: The one thermometer bulb is kept wet with the aid of a small fabric sleeve, which is connected to the small water reservoir. It is then whirled round rapidly to achieve the required air movement around the thermometer bulbs.

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