About 

Once used by seafarers to predict oncoming storms, this historical device responds to atmospheric fluctuations to forecast the weather!

How to Predict the Weather:
Clear liquid: Bright and clear weather. 
Cloudy liquid: Cloudy, possible thunderstorms & rain.
Small dots in the liquid: Humid or foggy weather.
Large flaky crystals: Cloudy skies, snow in winter.
Threads of crystals at the top: Windy weather.
Crystals at the bottom: Frost may be coming.