Hygrometer
As an artist and observer of the science of nature da Vinci was fascinated by the sky and sketched his observations of changes in the atmosphere.
His hygrometer is based on a simple balance scale. When dry the cotton and the weight opposite are in balance. As the cotton absorbs atmospheric moisture it grows heavier indicating an increase in humidity.
IMAGE: Hygrometer Photo: Vitaly Korovin / Shutterstock.com
Hygrometer
brass, Perspex, wadding and metal
