File:Smyths revised ozonometer, 1865. (9660571191).jpg

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Description To test ozone levels in the atmosphere, a test paper is held across 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. Smyth's revisions to his original instrument incorporated a boxwood canister to support the test paper and the design apparently made the measurements both faster and more accurate.
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Smyth's revised ozonometer, 1865.

Author Science Museum London / Science and Society Picture Library

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This image, originally posted to Flickr, was reviewed on 3 September 2013 by the administrator or reviewer File Upload Bot (Magnus Manske), who confirmed that it was available on Flickr under the stated license on that date.

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current10:25, 3 September 2013Thumbnail for version as of 10:25, 3 September 20131,250 × 1,015 (162 KB)File Upload Bot (Magnus Manske) (talk | contribs)Transferred from Flickr by User:Mrjohncummings

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