This device, which is also called an "agitator" is used to stir or shake up a mixture; the types generally used are flat blade, marine screw, turbine, and variable pitch screw.

From the BioTech Dictionary at http://biotech.icmb.utexas.edu/. For further information see the BioTech homenode.

Im*pel"ler (?), n.

One who, or that which, impels.

 

© Webster 1913.

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