A buret or burette is glass tube that allows delivery of a measured quantity of liquid. It is used in laboratory equipments. It was developed by Karl Friedrich Mohr using a pin on a rubber tube. The pinching action of the pin on the tube allowed the experimenter to deliver liquids drop by drop by and see the scale on the glass tube to determine the quantity of the liquid delivered.
In the present day burets, the pinching pin is replaced by glass valve that allows liquid to flow in one position and stops the flow in other positions.
Read for more detail on it.
http://www.rsc.org/chemistryworld/Issues/2008/March/MohrsBurette.asp
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