A professional who glazes tapered ends of glass tubes used in laboratory and medical instruments and apparatus, using gas burner and handtools. Responsibilities include:

• Heats tube on gas burner equipped with rolls that revolve tube in flame.
• Transfers tube between burners, set at graduated degrees of temperature, to expose tube to gradual heating and cooling process.
• May manually revolve tube on gas burner rolls to heat tube.
• May periodically glaze glass tubes, using hand torch.