Whirling Hygrometer

Whirling Hygrometer

Code: H199

£150.00 Approx $190.11, €175.64

Whirling hygrometer (sling psychrometer) by Casella fitted with matching thermometers, complete with built in distilled water bottle and wick in leather transport case. Circa 1950.

Together with relative percentage humidity slide rule.

Many instructions for use avaliable on the internet.