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Graduated scale for ozone test papers, 1851-1900.

Graduated scale for ozone test papers, 1851-1900.
4 0 c m
actual image size: 26cm x 32cm


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, such as this example made by Negretti and Zambra.

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© Science Museum / Science & Society Picture Library

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