[Edit] 
Answer
It is a device, made with nylon bristles attached to a twisted-wire shaft, used to knock the bottoms out of test tubes. Or at least it was when I was in high school chem class.
Answer
It is a brush that is long and narrow to clean the inside of glassware, in particular test tubes.
See the Web Links to the left for a picture.
First answer by JEK. Last edit by Jmowreader. Contributor trust: 180 [recommend contributor]. Question popularity: 27 [recommend question]
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