Old densimeter - DESMARAIS FRERES
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Old densimeter - DESMARAIS FRERES.
Works like the Baumé areometer that was 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 device: Immersed in the liquid, the tube sinks more or less according to the density of the liquid.
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.
These densimeters do not use the Degrés Baumé (°bé) which was a scale for measuring density, the Baumé degree scale is arbitrary and is only valid at a given temperature.
The degree Baumé was excluded from the French legal units on 3 May 1961.
The cases are made of cardboard, 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 densimeters 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 cases are between 268m and 33cm. The tubes are between 23.5cm and 31.5cm. Some have a label on the case: DESMARAIS FRERES.