Above there is a bulb, with it is another bulb lower down on the other arm. In one arm of the U is a vertical section of precise narrow bore (the capillary). Another version is the Ubbelohde viscometer, which consists of a U-shaped glass tube held vertically in a controlled temperature bath. These devices are also known as glass capillary viscometers or Ostwald viscometers, named after Wilhelm Ostwald. Standard laboratory viscometers for liquids Ostwald viscometers measure the viscosity of a fluid with a known density. These values are used for calibrating certain types of viscometers.
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