Capucina Chevalier Coffee Maker January 22, 2019 08:40:00
A vacuum maker brews coffee using two chambers where vapor pressure and vacuum produce brew which is clean rich and smooth compared to other brewing methods. This type of maker is also known as vac pot siphon or syphon coffee maker and was invented by Loeff of Berlin in the 1830s. These types of makers have been used for more than a century in many parts of the world. The chamber material can be pyrex metal or plastic and the filter can either be a glass rod or a screen from cloth paper or nylon. The Napier Vacuum Machine presented in 1840 was an early example of this technique. While vacuum makers are generally to complex for everyday use they were prized for producing a clear brew and were quite popular until the middle of the twentieth century.
The idea of a vacuum coffee maker is to heat water in the lower vessel of the brewer until the expansion forces the water through a narrow tube into an upper vessel that contains the coffee grounds. When the lower vessel has more or less emptied itself and enough time has elapsed the heat is removed and the resulting vacuum will draw the brewed beverage through a strainer back into the lower chamber from which it can be stored. The device must usually be taken apart to pour into a mug. An early variation of this principle is called balance siphon. This variation has the two chambers arranged side by side on a balance like device with a counterweight attached to the heated chamber.