Mineralogists and geologists are, as a rule, very critical in regard to their selection of a geological hammer. Every one has exactly the type of hammer he thinks most useful for his purpose. With a view of crystallizing this opinion, in 1922, when on an excursion of the Belgian Geological Congress in the Ardennes, all the hammers of the party were placed on exhibition and photographed. As so many different types were represented it seemed of sufficient interest to reproduce this photograph in The American Mineralogist.

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