Psychrometer -Humidiymeter- Hygrometer – wet and dry thermometer.

Psychrometer -Humidiymeter- Hygrometer – wet and dry thermometer.


Psychrometer -Humidiymeter- Hygrometer - wet and dry thermometer.


30 cm high



Country of manufacture


Categories: Scientific, Technology, Barometers & Meteorology, Office Antiques, Other Technology Antiques




Vertalen uit het: Engels

Dutch Psychrometer -Humidiymeter- Hygrometer – wet and dry thermometer.
This instrument with a conversion table comes from the former possession of an old school and is in good working order.
Will be well packaged and sent by registered mail, shipping costs depend on the destination

Meteorological instruments such as these have a number of associated names, hygrometer meaning the measurement of moisture or water, the name psychrometer (cold meter) was used by the German inventor Ernst Ferdinand August (1795-1870) and during the same period in 1836, the Surgeon, John Abraham Mason was presenting his new, Mason’s Hygrometer. An article in the Record of General Science describes a “new hygrometer illustrated by experiments and a comparison of its results with Sir John Leslie’s”. Leslie had developed an air thermometer based upon Galileo’s thermoscope in 1805. Sadly, Mason’s name is no longer commonly associated with his invention but its continued manufacture into the 1840’s and 50’s is testament to its superior accuracy.

It is now more commonly dubbed, the wet and dry thermometer relating to the comparison of two thermometers, one with a wet bulb and the other dry. This is essentially the same as Mason’s pattern where one thermometer is kept wet by means of a water soaked sock covering one bulb and the other kept dry. The evaporation of water from the sock has the effect of lowering the temperature reading on the wet thermometer and the difference against the dry thermometer is used to calculate relative humidity of the air.

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NL Early Science

Early Science antiques was founded in 1978 by Fred de Vree based in the Netherlands where I can also be visited by appointment. I have been active for 4 decades as an antiqair and auctioneer, the last 20 years of which are specialized in scientific antiques. I visit collectors and fairs in many European countries. looking for special items please feel free to contact me by Phone or email ,if you need any information on my listed items or something you are looking for 0031653132842

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