A professional who fills, shapes, seals, and marks glass tubes to fabricate thermometers, using vacuum tank, micrometer, gas burners, and handtools. Responsibilities include:

• Places thermometer tubes in vacuum tank filled with colored liquid and secures tank lid.
• Turns handle to create vacuum in tank that causes fluid to fill tubes.
• Holds end of filled tube over gas flame until glass changes color.
• Inserts air bulb into unheated end of tube and squeezes air into tube to form thermometer bulb.
• Rotates bulb in preset micrometer to attain specified size.
• Holds open end of tube over flame to soften glass and seal tube.
• Immerses tube in temperature controlled hot and cold water tanks to determine reference point for calibrating tubes.
• Scribes marker at reference points, using file.
• Heats and cools water in tanks to specified temperatures, using heater, ice, and master thermometer.
• May blow and shape glass tubes used to make thermometers.