Little journey through time in the
history of humidity measurement

1783 - First hygrometer utilizing human hair developed by de Saussure

Part 2: Swiss naturalist Horace Benedict de Saussure, born 17.02.1740 in Conches, died 22.01.1799 in Geneva.

In 1787 the Swiss naturalist became the second person to climb Mont Blanc, the height of which he was able to work out using a barometer, declaring it the highest mountain in Europe.

His extensive meteorological observations led to the development of meteorological instruments, so he developed in 1783 the first hygrometer utilizing human hair to measure humidity.

In the past women's hair was used changing length when moisture is absorbed. Today, synthetic substances are formed as fine threads, being able to meet today's requirements for accuracy, long-term stability and robustness. Galltec GmbH has the experience and offers a versatile, fully developed programme of humidity measuring technology.

1780 - Le Roy's hygrometer

Part 1: French scientist Jean Baptiste Le Roy, born 1720 in Paris, died 1800 in Paris.

In 1780 the physicist developed a condensation hygrometer which measured the water vapour amount in air by means of cooling. The hair hygrometers known at the time offered the advantage of displaying the humidity directly and immediately, but they were inaccurate.

Le Roy used a tin container filled with water with a thermometer attached to a holder. The temperature of the water in the container was cooled down by gradually adding small pieced of ice, thereby also cooling down the temperature of the immediate surroundings. The ambient air, which was colder now, quickly became saturated and condensed on the outer wall of the tin container. The water temperature measured now corresponds to the dew point temperature which, in turn, is dependent on the relative humidity.


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