Old Baumé areometer

Condition: Used

Old Baumé areometer

Invented in 1770 to measure the concentration of a liquid or the density of a solution. The principle of floating bodies governs the operation of this apparatus.

Areometers are usually made of metal or glass, weighted with lead or mercury, so as to maintain a stable balance in the liquids where they are immersed. When an areometer is placed in the oil, it goes up and down into the liquid until it floats freely. The point at which the surface of the oil touches the stem of the areometer is a measure of the density of the sample.

The Baumé degrees (°bé) is the measurement scale of density, but the Baumé degree scale is arbitrary and is only valid at a given temperature.
This is why the temperatures for which the areometer is used are indicated on the cardboard tubes containing the areometer.

The degree Baumé is no longer used since its exclusion from the French legal units on May 3, 1961.

The cases are made of cardboard or metal, they come from the company DESMARAIS brothers. A company founded in 1861 for the treatment of vegetable oils and in particular the refining of rapeseed oils for lighting, the company then turned to that of oil. It merged with Total in 1966.

These areometers were therefore used to measure the density of oil. The lighter a crude oil, the lower its density and the lighter its quality will be.

The casings are between 26cm and 30cm. The tubes are between 23.5cm and 25.5cm. They all have a label on the DESMARAIS FRERES case.

23,00 €

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