Psychrometre, Jules Richard en Rétractomètre L. M (2) - Aluminium, Metaal - Tweede helft 20e eeuw

Psychrometre, Jules Richard en Rétractomètre L. M (2) - Aluminium, Metaal - Tweede helft 20e eeuw


Performed during the third quarter of the 20th century (after 1960), this aspiration psychrometer is of the NG 5303 type of the Jules Richard Etablissements. It was founded in Paris in 1845 by Richard Père and manufactured (and exclusively) metal barometers with compensated Bourdon tubes. In 1876, his son Jules succeeded him and produced aneroid barometers and then filed in 1880 a patent for a barometer recorder. In 1882, he joined forces with his brother Félix in the Richard Frères society, then became sole owner again in 1891, the year he filed a patent for a stereoscopic twin, Vérascope. Installed at 25 rue Mélingue (formerly impasse Fessart), transformed into a public limited company, the company builds recorders and indicators, and cameras (to, among others, aviation). Becoming Jules Richard Instruments, she bought Maxant Industries in 1999, with which she merged in 2008 to become JRI Maxant. Its head office is located at 116 quai de Bezons,

. a psychrometric table with moving ruler. The device consists of a rectangular metal housing opening on the front with a sliding door and on the back with a hinged door. The front door is equipped with two vertical slots that read the graduations of the two thermometers in the housing, one (usually the right one) dry and the other wet. Preserved accessories: special forceps, muslin to moisten with pure water, humidifying pear and winding key (from a small fan for the aspiration of the air). The device has its original carrying case, leather.

It measures the relative humidity of the ambient air.
Composed of 2 identical mercury thermometers, with the difference that one of the thermometers must be covered on its lower part with a muslin soaked in water.
There is therefore a 'dry' thermometer and a 'wet' thermometer.

A key is used to reassemble a mechanism, which turns a fan. For 4 to 5 minutes, the bottom of the thermometers is evenly ventilated.
The air evaporates the water contained in the muslin. This causes a drop in the temperature of the wet thermometer.
The difference in temperature read between the two thermometers makes it possible to deduce, with the aid of a sliding graduated table, the value of the relative humidity.

I don't know about the functionality, I don't know how it works.

Leon Maxant was born in 1856 and died 1936
1856manufacturers of barometers and other measuring instruments

The history of the Maxant House is characterized by mergers with companies with the rich traditions of watchmaking and precision mechanics from the first half of the 19th century.

Léon-Charles Maxant (1856-1936) began in 1879 with the production of watch movements. In 1887, he took over the "Maison Desbordes", a long-established company, founded in 1824 and headquartered

Desbordes said, such as its physical mathematical optical nautical instruments, as well as safety devices for steam

Maxant is undoubtedly with the tradition of the initial purchase and marketed from now on is called:

Precision Instruments, Léon Maxant Sr. - 64, rue de Saintonge - Paris, founded in 1824.

The company produced everything that had to do with the pressure or the measurement of the air pressure, namely barometers, manometers, barograph.

Dimension case : 17 x 11 x 9 cm
Dimension appareil : 15 x 6 x 7cm
I don't know much about this instrument or what it is doing. It's complete, have the key to turn the mechanism but the cilinder is not turning. You can hear it running like a clock.

Aantal items
Psychrometre, Jules Richard en Rétractomètre L. M
Aluminium, Metaal
Ontwerper / kunstenaar
Jules Richard and Leon Maxant
Jules richard Paris
Model / Naam
No. 6187 and No. 188
Geschatte periode
Tweede helft 20e eeuw
Land van herkomst
Goede staat - gebruikt met kleine tekenen van ouderdom en vlekjes
28×11×8 cm
1022 g
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