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Leon Teisserenc de Bort is a French meteorologist known for his research in aerology, dynamic meteorology, one of the discoverers of the stratosphere.
In 1896 Leon Teisserenc de Bort set up a large meteorological observatory at his estate Trappes near Versailles. From there, since 1898, he flew over 200 special balloons equipped with self-writing instruments capable of reaching very high altitudes. Teisserenc de Bort also flew kites with self-writing instruments that could reach the highest altitude of 5200 meters.
These experiments helped Leon Teisserenc de Bort to establish that the atmosphere consists of two layers. He found that in the lower layer (troposphere) there is a constant change in temperature which leads to the weather change, and in the upper one which he called the stratosphere (altitude over 11 km) the temperature is almost constant.