Methods of air analysis / by J.S. Haldane.

  • John Scott Haldane
Date:
1920
Catalogue details

Licence: In copyright

Credit: Methods of air analysis / by J.S. Haldane. Source: Wellcome Collection.

    17/162 page 11
    METHODS OF AIR ANALYSIS. THE COLLECTION OF SAMPLES OF AIR. In any investigation of the composition of air the first step is the collection of a sample for analysis. In collecting a sample it is necessary to take care (1) that the sample is not altered in the process of collection or storage, (2) that the vessel containing the sample is thoroughly air-tight. It is also very desirable, to use a vessel which can be handled conveniently, and from which a portion of the sample can be transferred con¬ veniently to the gas-analysis apparatus. The simplest case is where the sample can be collected directly in the burette of the gas-analysis apparatus. This method can be used with a portable apparatus for the analysis of air at any point, for instance, in an ordinary room, an air-way in a mine, an experimental respiration chamber, etc. The burette is filled with mercury in the ordinary way described below, the tap of the burette closed, and the mercury reservoir lowered, so that on opening the tap at the point where a sample of air is wanted the inercurj^ runs out of the burette and
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