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A thistle tube is made of glass and is used in laboratories to add liquid to beakers of other liquids or sometimes to other pieces of equipment.
A thistle tube is a long hollow pole of glass which has a funnel at the top. Liquid is put into the top and travels down the tube and comes out the thin end of the tube in small drips which can be used anywhere. It is usually quite precise.
- Information on the function of a thistle tube Archived 2007-06-27 at the Wayback Machine
- Thistle Tube feeders for birds merchandise Archived 2010-06-17 at the Wayback Machine