Abstract
An account is given of a comparison carried out at the National Physical Laboratory of the röntgen (the unit of quantity of X rays) as realised by the portable guarded-field ionisation chamber of the Bureau of Standards and the primary free-air standard ionisation chamber of the National Physical Laboratory. The Bureau of Standards subsequently carried out a similar comparison with the standard chamber at the Physikalisch-Technische Reichsanstalt. The ultimate agreement between the results for the three National Laboratories is within 0·5 per cent. The main factors regarded as important in the experimental realisation of the röntgen are summarised in the paper.
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