Thunderglass with cast iron holder

This weather forecasting instrument has its origin at the beginning of the 17th century

Its use is very simple. During bands of high pressure on sunny days, the water level is pushed down into the spout, whiile during bands of low pressure on cloudy and rainy days, the water rises within the spout. In an approaching storm it rises so much that it will begin to drip.

Packed in printed gift box.
Includes: pigment for colouring the water and ijector needle for easy feeling