The Fortin Barometer

The Fortin barometer is a variation of the classic torricelli barometer working on the same principles as any other barometer but with a different construction. The one most notable difference between the two is that the Fortin barometer has the cistern made out of leather instead of metal like the aforementioned mercury barometer. The way the Fortin barometer works is different in a sense that it uses atmospheric pressure to balance the weight of a column of mercury against it. From that, any change in the atmospheric pressure is accompanied by an immediate change in the level of the mercury and can be measured against the scale engraved on the barometer. To be able to use the Fortin barometer in good measuring conditions you should aim for exposure spots where the temperature is uniform, the light is good and the Fortin barometer has a solid mounting both vertically and horizontally. As with any other liquid based barometer great care should be taken when transporting it from place to placn be.

The Fortin Barometer is mostly used for meteorological measurements whenever high accuracy and reliability are required. The Fortin barometer has been particularly designed for usage in meteorological land stations. Barometers are to be hung or mounted vertical, preferably on a solid wall, and require adequate exposure and accurate management.

Out of all the possible liquid based barometers the Fortin barometer is the most popular one offering great accuracy and reliability under the harshest weather conditions. The Fortin barometer is made out of a glass tube in which a tube of mercury is suspended making the cleaning process a bit more tricky. First you will need to place the Fortin barometer on a foam pad, cloth or cushion. The barometer’s delicate glass casing is fragile and may crack if it falls over during the cleaning process so special attention is required. Place the Fortin barometer in an upright position to keep the mercury from shifting from side to side. Lean the barometer against a steady surface, such as a wall and then wipe the barometer with a dry cloth to remove most loose surface dust and debris, use light pressure to avoid scratching the barometer’s glass casing with any bits of dust that are caught in the cloth. Finally you will need to wet a second piece of cloth until it’s damp to the touch. Spray the barometer with some glass cleaner, afterwards wipe it with the damp cloth and allow it to dry thoroughly before placing it back where it belongs.

fortin barometer