glass tube

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Diet ingredients were placed in a sterile glasstube and mixed for 1 min in a vortex mixer.
Chambers were composed of a male and female ground glass joint tapered distally at each end to a 65 mm glasstube.
To avoid damaging the wasps, seeds with hosts were placed on a punched piece of cardboard and placed in a glasstube (9.5r2.2 cm).
The pulse energy was measured with a calorimeter having an alcohol-filled glasstube intended to absorb microwaves.
The parasites and their eggs and larvae have simply to be placed in a small glasstube filled with alcohol.
In this experiment a large number of larvae were put into a closed glasstube half of which was covered with black paper.
Every two months, a glasstube was opened and the powder dissolved.
Each snail was infected by placing it in a 20 ml glasstube containing 10 ml dechlorinated water, to which four miracidia obtained as previously described were added.
The current configuration is a 10 mm glasstube over a 5 mm hole in the ablator and this appears to be acceptable for the capsule designs.
The ends of the inner glasstube are usually fitted with ground glass joints which are easily fitted with other glassware.
From
Wikipedia