This apparatus is used to demonstrate 'Brownian' or random motion of smoke particles. A specially designed plastic box, with a sliding lid, contains a glass smoke cell, a cylindrical 'Whitley Bay' pattern condensing lens and a low voltage festoon bulb. The components are pre-adjusted so as to focus the light at the correct height in relation to the smoke cell, ensuring that observation is enhanced.Overall height 25 mm. approx. Fitted with 4mm socket terminals for connection to 12 V, 3W supply. |
