Abstract
THIS is another volume of the small Aide-Memoire series by the author of the work on “Special Steels,” which was reviewed some time ago. Considering the size and price of the book, a good account of the subject is given, though, in common with many other enthusiasts, the author is inclined to claim too much for his subject, p. 7, “et de reésoudre tous les problèmes...,” and in describing the preparation of the polished face of the section for examination, is too severe in his conditions, namely, “perfectly polished so that there remains no scratch visible at the highest power of the microscope.” Much time has been wasted in the past in striving after this ideal. It is not necessary, unless when looking for the finest cracks, and, combined with a somewhat elaborate series of precautions, is apt to discourage the reader from beginning practical work. Advice such as that given on pp. 69 and 70 has always been impressed on beginners by the writer, namely, that the section is prepared for observation and study, not merely for photographing, and that the polished section should always be examined carefully before etching in any way, as then small holes, oxides, scoriæ, and sulphides are generally much more easily seen against the polished metallic surface than after etching.
La Métallographie Microscopique.
By Louis Révillon. Pp. 176. (Paris: Gauthier-Villars, n.d.) Price 3 francs.
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MCWILLIAM, A. La Métallographie Microscopique . Nature 84, 295 (1910). https://doi.org/10.1038/084295b0
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DOI: https://doi.org/10.1038/084295b0