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Engineering metrology, or dimensional Measurement in engineering as it may otherwise be termed, is a subject which has become of increasing importance to production engineers during the past fifteen years or so. This has been recognized by the Institutions of Mechanical and Production Engineers and it is now include as a subject in their Associate Membership examinations, and also for the Higher National Certificate. Up to the present time, however, books dealing with the subject have been few, and the above book is a welcome acquisition to the number, as it provides an up‐to‐date survey of a subject in which progress is rapid. Mr Hume is well qualified to write on the subject as, in addition to his experience in his present post as Metrology Superintendent of the de Havilland Engine Co. Ltd., he has had a number of years' experience in the Metrology Division of the National Physical Laboratory and at Hilger and Watts Ltd.