El-12 Cottrell Smoke Precipitator
Published: Tuesday 14 March 2006 - Updated: Thursday 31 March 2011
To demonstrate an industrial application of electrostatics.
- Van de Graaff generator
- Cottrell precipitator (as in diagram)
- Incense sticks
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Cottrell Smoke Precipitator
Smoke from incense sticks passes through a glass tube containing a central electrode and an outer earthing mesh. The smoke is clearly visible. On applying high voltage to the central electrode the smoke issuing from the top of the "chimney" is greatly reduced.