In view of the practical interest in a method for measuring directly the rate of oxidation, i. e., the oxidizability of rubber, it has seemed worth while to devise an apparatus with which the technic of making such measurements is so simple that it is within the compass of operators with no particular training. With this in mind the author has been led to construct a new manometer for measuring oxidizability. Before describing the apparatus and its method of operation, however, it is necessary to explain its principles. Later on, it is intended to deal in a more thorough way with the significance of the measurements, with the various causes of errors arising from the nature of the substance studied and the technic employed, and finally with different ways of expressing the results obtained.

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