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D.EX

APR 1 0 1922

PREFACE.

A CONSIDERABLE portion of this the fifth volume of Engineering Facts and Figures, which is now presented to the Reader, is taken up with notices of several of the Departments of the Paris Exhibition of 1867-the great event of the year-of which its pages are a record. Much of the matter in connection with this great gathering of the materials and objects connected with the Arts and Sciences, has been specially prepared for the pages of this work; while much also has been culled from Journals which are named below. In addition to this special feature of the present volume, the features which have distinguished preceding volumes have also in great measure been attended to and secured. These have, however, in consequence of the length to which the Paris Exhibition matter has extended, been considerably contracted; and are, indeed, mainly confined to abstracts or reproductions of the leading papers of the year read before the various societies, and a few of the most valuable and suggestive papers of the leading Journals. In preparing the volume, the Editor has to acknowledge