Storm/thunder glass with wooden base and brass drip tray, also showing the weather forecast. A storm glass is a very effective weather forecaster, superb with thunder; incredibly, it is always accurate. The water rises in the spout at a low air pressure and drops at a high air pressure. With an upcoming storm, the glass can even overflow. For that reason, it has a brass drip tray beneath the glass The device works best in a uniformly heated room. Don’t hang it in direct sunlight or above a heater. Top up the glass with water, preferably distilled (pharmacist) or demineralised to approx. 2 cm above the beginning of the spout. Possibly colour with a few drop of dye (green, blue, red, purple will fit in any interior) Because the water evaporates gradually, you will occasionally need to refill the glass. In original box