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Others are less complicated, and also less exact, but still require quite a troublesome manipulation such, for example, as the process of Pettenkofer, as modified by Fodor, that of Hesse, etc. Montsouris Apparatus. Smith's Minimetric Apparatus. Bertin-Sans Apparatus. Bubbling Glass. Pipette. Arrangement of the U-shaped Tube. It is from such efforts that have resulted the processes of Messrs.
The problem consists in determining the minimum of air required to make the known solution turbid. Hence the name "minimetric estimation," that has been given to this process. Prof. Fischli, assistant to Prof. Weil, of Zurich. I have employed it frequently, and I use it every year in my lectures. I find it very practical, provided one has got accustomed to using it.
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