THIS second edition differs but little from its predecessor. A few more corrections, a revised section on air survey (or “aerial survey” as the author calls it), and an appendix on pivotal errors in theodolites constitute the changes. The book is written for students of civil engineering. Naturally, therefore, it is a text-book on engineering rather than on topographical surveying., and it lacks the practical hints, and models of computation, which should be included for the latter purpose. The civil engineer will, however, find in it a clear explanation of all the methods he is likely to employ. Unlike many authors of works on surveying, Mr. Norman Thomas is at pains to examine the precision of each method he describes. He does so with conspicuous success, and illustrates his mathematics by examples drawn, in the main, from surveys in Great Britain and in the Empire.


    By Dr. W. Norman Thomas. Second edition. Pp. viii + 548. (London: E. Arnold and Co., 1926.) 25s. net.

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    Surveying . Nature 118, 440 (1926).

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