Old Lab Burners are a type of laboratory equipment used to heat substances. They are also known as Etnas, which is an acronym for Electric Tube-Nose Apparatus. These burners are typically used in chemistry and biology laboratories to heat up chemicals or other substances. They are usually made of metal and have a long tube-like shape with a nozzle at the end. The nozzle is used to control the flame and the temperature of the burner. Old Lab Burners are still used today, although they have been replaced by more modern versions.