The Air-Tester.
An air-tester foe showing the de gree of contamination of the air of a workshop or other place where people are crowded together, is an interesting apparatus lately shown in Zurich. A closed glass vessel is filled with a red fluid having the property of being bleached by carbonic acid. One end of a glass siphon dip 3 into the liquid, and from the other end a drop falls every one hundred seconds, and glides slowly down a cord kept stretched by a weight. The more carbonic acid the air contains, the quicker the drop loses colour. The drop may turn white near the upper end of the cord, if the air is very foul, or may pass nearly to the other end before the change takes place, such graduations as " extremely bad," " very bad," " passable " and " pure " being marked on a scale for the guidance of the observer.
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https://paperspast.natlib.govt.nz/newspapers/MH18961003.2.17
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Manawatu Herald, 3 October 1896, Page 3
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151The Air-Tester. Manawatu Herald, 3 October 1896, Page 3
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