A weather glass, or also called thunder or storm glass, is actually an 'old-fashioned' type of barometer, which reliably and accurately reflects the weather forecast. Old-fashioned in quotation marks because it was already used early in the 17th century but still today. It is also a very decorative object.

Taking into use:

The weather glass is filled with water with a dye, eg: blue or red. The amount of water needed in it can be seen on the pictures above. Very precisely it does not come but keeps about the above. This weather glass hangs on a red background of baked clay. There are also cast iron back panels available or you can make a back wall of wood yourself where you hang the weather glass on.

The weather glass only has an opening at the top of the spout, otherwise it is completely closed. After filling (keep on the back) and adding the dye (with a syringe) you can hold it aside until the water levels are approximately equal. This is not necessarily necessary. After about a day he corrected himself and can be read.

The operation:

Because the reservoir is closed at the top and is further closed by the liquid creates an overpressure above the liquid in stable weather (high pressure area), because this high air pressure squeezes the liquid into the spout down. If there is a low air pressure (low pressure area, unstable weather), the excess pressure in the reservoir will cause the liquid to be squeezed into the spout and thus the level in the spout will be higher.

In short:

The lower the water in the spout, the better the weather and the higher the water is in the spout, the worse the weather. It can even drip out when a heavy storm is coming. (This is why there is often a drip tray under the glass) If you do not hang the weather glass over a heat source or under direct sunlight, this is a very reliable instrument, which was used by sailors on ships in the past.

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