Smyth's ozonometer components, 1864.

Smyth's ozonometer components, 1864.
3 4 c m
40cm
actual image size: 32cm x 26cm

Description

The glas tap, bras supports for the test papers and a canister of test papers from John Smyth's ozonometer. To test ozone levels in the atmosphere, a test paper is held acros an air stream drawn into the ozonometer for a fixed length of time or for a fixed volume of air. The test paper, having been treated with chemicals (such as iodide of starch) before exposure, changes colour according to the amount of ozone in the air and can be compared with a prepared scale.

Image Details

Image Ref.
 
10327180

© Science Museum / Science & Society Picture Library

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