Smoke cell is an apparatus used for the observation of Brownian motion in smoke particles. It comprises a box with plastic lid as well as flanges to be used with a microscope. The box consists of a smoke cell and a cylindrical condensing lens. Illumination is provided by a 12 volts 3 watt festoon bulb. Apparatus is pre-set to focus the light at correct height. The dimensions of the apparatus are 90 x 46 x 20 mm. The set is supplied with a squeeze bottle type smoke generator and user manual.