Smyth's ozonometer, 1864.

Smyth, John

 
Smyth's ozonometer, 1864.
4 0 c m
 
23cm
actual image size: 15cm x 32cm

Description

Watercolour depicting the ozonometer installed at the top of a building. The air to be tested is drawn in from the roof by adjusting the water levels in a barrel. The test paper is held acros the air stream 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 against a prepared scale.

Image Details

Artist
 
Image Ref.
 
10327179

© Science Museum / Science & Society Picture Library

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