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Updated: May 17, 2025
Schoenbein's ozonometer consists of 750 slips of dry bibulous paper prepared in the manner described; and with a scale of tints and instructions, sufficient to make observations on the ozone of the atmosphere twice a day for a year. After exposure to the ozone, they require to be moistened to bring out the colour.
Such is a summary of M. Schoenbein's views as communicated to the Medical Society of Basel; and we the more readily accord them the publicity of our columns, as, apart from the intrinsic value of the subject, it is one which has for some time excited the interest of scientific inquirers in this country.
The coloration is determined by comparison with a scale having eleven degrees of intensity upon it. Compared with Schoenbein's ozonometer, the results are in general directly opposite. The thallium papers show that the greatest effect is in the daytime, the iodide papers that it is at night. Yearly curves show that the former generally indicate a rise when the latter give a fall.
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