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Vertical Barometer Of Physicist - Mercury - Designer Of Fortin - Period: XIXth Century

Name: Vertical Barometer Of Physicist - Mercury - Designer Of Fortin - Period: XIXth Century
Brand: Antikeo
SKU: F41DR1I7O6
Price: 450 EUR
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Description

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Physicist's vertical mercury barometer for measuring atmospheric pressure. Torricelli tube and wooden wall support.

The barometer is an instrument used to measure atmospheric pressure. The Torricelli tube as it is represented in physics textbooks is a veritable barometer, but in order for it to be able to measure this pressure with precision and for it to be transportable, its shape had to be modified. The Fortin barometer, named after its designer, Jean Nicolas Fortin (1750-1831) is a portable and very precise cuvette barometer.

Period: XIXth Century
Circa: 1825-1830
Dimensions: Height: 107cm x Width: 11.7cm x Depth: 2.5cm

The cuvette containing the mercury has a mobile bottom.
When you turn the knurled knob, you act on a chamois pocket containing the mercury in which the lower end of the barometric tube is immersed.

The level of mercury is visible through a glass cylinder which extends the flexible bag. The end of a fixed ivory point materializes the "zero" of the millimeter scale engraved on the upper part of the brass sheath which surrounds the glass tube over its entire length.

A mobile cursor bearing a 1/20 vernier moves along the millimetric ruler by the play of a rack and pinion controlled by a knurled knob.

A little reminder of elementary physics, do you know that the so-called "normal" atmospheric pressure corresponds to a height of mercury equal to 760mm?

In our international unit system (SI), pressure is expressed in pascals (Pa).
It is customary to give the atmospheric pressure in hectopascal (hPa).

760 mm Hg ≃ 1013 hPa

Ref: F41DR1I7O6

Additional Information

Style	French Restoration, Charles X (Barometers, Thermometers of French Restoration, Charles X Style)
Period	19th century (Barometers, Thermometers 19th century)
Country of origin	France
Width (cm)	12
Height (cm)	107
Materials	Brass